{"id":"CVE-2026-65634","aliases":["AZL-103422","DEBIAN-CVE-2026-65634","EEF-CVE-2026-65634","EUVD-2026-84340","GHSA-qghx-23m5-r55m","OESA-2026-4255","OESA-2026-4256","OESA-2026-4257","UBUNTU-CVE-2026-65634","USN-8901-1"],"status":"published","title":"Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00266,"percentile":0.18623,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2026-09-22T08:49:24Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure 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"0"},{"fixed":"1:27.3.4.6+dfsg-1ubuntu0.2"}]}],"versions":["1:27.3.4.1+dfsg-1build1","1:27.3.4.3+dfsg-1","1:27.3.4.4+dfsg-1","1:27.3.4.6+dfsg-1","1:27.3.4.6+dfsg-1ubuntu0.1"],"bundled":30}],"products":[{"vendor":"erlang","product":"otp"}],"references":[{"url":"https://github.com/erlang/otp/security/advisories/GHSA-qghx-23m5-r55m","tags":["related","vendor-advisory","advisory","report"]},{"url":"https://cna.erlef.org/cves/CVE-2026-65634.html","tags":["related","web","report"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-65634","tags":["related","web","report"]},{"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions","tags":["x_version-scheme","web","report"]},{"url":"https://github.com/erlang/otp/commit/0fe2c02fdc06fab1c63be9db1a7456993d20f838","tags":["patch","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65634","tags":["web","advisory"]},{"url":"https://github.com","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65634.json","tags":["advisory"]},{"url":"https://github.com/erlang/otp","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-65634","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4255","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68956","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89422","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4256","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4257","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-65634","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-65634","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8901-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-4748","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2025-26618","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2025-30211","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-21620","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-23942","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-23943","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-28808","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-28810","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-32144","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-32147","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-42789","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-42790","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-42791","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-47078","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-48855","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-48856","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-48858","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-48860","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-49759","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-49760","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-53422","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-54886","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-54887","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-54891","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-55950","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-55952","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-68956","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-74994","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-89422","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-65634","title":"Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T08:49:24.743Z","modified":"2026-09-24T20:06:38.007Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T13:37:13.934727Z"}],"euvd":[{"id":"EUVD-2026-84340","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T08:49:24Z","modified":"2026-09-24T20:06:38Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:56.296478Z"}],"nvd":[{"id":"CVE-2026-65634","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T09:17:05.09Z","modified":"2026-09-24T21:17:20.657Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:12:50.368368Z"}],"osv":[{"id":"CVE-2026-65634","title":"Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T08:49:24.743Z","modified":"2026-10-28T02:30:55.758129551Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:45:14.46177Z"},{"id":"DEBIAN-CVE-2026-65634","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.  The BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.  The vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).  This vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.  This issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T09:17:05.09Z","modified":"2026-10-23T06:01:07.854080705Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:58.699079Z"},{"id":"EEF-CVE-2026-65634","title":"Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder","description":"## Summary\n\nInefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder `asn1rtt_ber:dec_subidentifiers/3` in `lib/asn1/src/asn1rtt_ber.erl` and the equivalent PER helper `asn1rtt_per_common:dec_subidentifiers/3` in `lib/asn1/src/asn1rtt_per_common.erl` accumulate a base-128 subidentifier into an unbounded integer using `(Av bsl 7) + H` per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper `asn1rtt_jer:json2oid/1` in `lib/asn1/src/asn1rtt_jer.erl` exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including `OTP-PUB-KEY` which is reached during X.509 certificate parsing via `public_key:pkix_decode_cert/2`. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files `lib/asn1/src/asn1rtt_ber.erl`, `lib/asn1/src/asn1rtt_per_common.erl` and `lib/asn1/src/asn1rtt_jer.erl` and program routines `asn1rtt_ber:dec_subidentifiers/3`, `asn1rtt_per_common:dec_subidentifiers/3` and `asn1rtt_jer:json2oid/1`.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T08:49:24.743Z","modified":"2026-09-22T09:11:02.346890255Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:46:33.520522Z"},{"id":"OESA-2026-4255","title":"erlang security update","description":"Erlang is a general-purpose programming language and runtime environment. Erlang has built-in support for concurrency, distribution and fault tolerance. Erlang is used in several large telecommunication systems from Ericsson.\r\n\r\nSecurity Fix(es):\n\nInefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.(CVE-2026-65634)\n\nAllocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler.\n\nThe \u0026quot;session\u0026quot; clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable.\n\nThis issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.(CVE-2026-68956)\n\nKey Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server\u0026apos;s certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \u0026quot;no PSK\u0026quot; value and keys the handshake with the ordinary non-PSK schedule, so the attacker\u0026apos;s own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP 22.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.(CVE-2026-89422)","status":"published","published":"2026-10-16T11:58:39Z","modified":"2026-10-16T12:15:06.301162786Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"OESA-2026-4256","title":"erlang security update","description":"Erlang is a general-purpose programming language and runtime environment. Erlang has built-in support for concurrency, distribution and fault tolerance. Erlang is used in several large telecommunication systems from Ericsson.\r\n\r\nSecurity Fix(es):\n\nInefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.(CVE-2026-65634)\n\nAllocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler.\n\nThe \u0026quot;session\u0026quot; clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable.\n\nThis issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.(CVE-2026-68956)\n\nKey Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server\u0026apos;s certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \u0026quot;no PSK\u0026quot; value and keys the handshake with the ordinary non-PSK schedule, so the attacker\u0026apos;s own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP 22.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.(CVE-2026-89422)","status":"published","published":"2026-10-16T11:58:39Z","modified":"2026-10-16T12:15:06.645432959Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"OESA-2026-4257","title":"erlang security update","description":"Erlang is a general-purpose programming language and runtime environment. Erlang has built-in support for concurrency, distribution and fault tolerance. Erlang is used in several large telecommunication systems from Ericsson.\r\n\r\nSecurity Fix(es):\n\nInefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.(CVE-2026-65634)\n\nAllocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler.\n\nThe \u0026quot;session\u0026quot; clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable.\n\nThis issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.(CVE-2026-68956)\n\nKey Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server\u0026apos;s certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \u0026quot;no PSK\u0026quot; value and keys the handshake with the ordinary non-PSK schedule, so the attacker\u0026apos;s own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP 22.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.(CVE-2026-89422)","status":"published","published":"2026-10-16T11:58:39Z","modified":"2026-10-16T12:15:05.79506544Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"UBUNTU-CVE-2026-65634","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake. The BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware. The vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates). This vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1. This issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T09:17:00Z","modified":"2026-10-17T12:59:17.493670614Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:56:53.710209Z"},{"id":"AZL-103422","title":"CVE-2026-65634 affecting package erlang for versions less than 26.2.5.21-8","description":"Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake.\n\nThe BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware.\n\nThe vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.","status":"published","published":"2026-09-22T09:17:05Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:17.528763Z"},{"id":"USN-8901-1","title":"erlang vulnerabilities","description":"Wander Nauta discovered that Erlang incorrectly handled absolute paths when\nextracting zip archives. An attacker could possibly use this issue to write\narbitrary files outside of the intended directory. This issue only affected\nUbuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-4748)\n\nIt was discovered that the Erlang SFTP server did not properly limit the\nsize of packets. A remote attacker could possibly use this issue to cause\nErlang to use excessive resources, leading to a denial of service. This\nissue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and\nUbuntu 18.04 LTS. (CVE-2025-26618)\n\nIt was discovered that the Erlang SSH server did not properly limit the\nlength of algorithm names in key exchange messages. A remote attacker could\npossibly use this issue to cause Erlang to use excessive resources, leading\nto a denial of service. This issue only affected Ubuntu 14.04 LTS,\nUbuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2025-30211)\n\nIt was discovered that the Erlang TFTP server incorrectly handled certain\nfile paths. A remote attacker could possibly use this issue to access files\noutside of the intended directory. (CVE-2026-21620)\n\nIt was discovered that the Erlang SFTP server incorrectly validated paths\nagainst the configured root directory. An authenticated user could possibly\nuse this issue to access files outside of the root directory.\n(CVE-2026-23942)\n\nIt was discovered that the Erlang SSH server enabled zlib compression by\ndefault and did not limit the size of decompressed data. A remote attacker\ncould possibly use this issue to cause Erlang to use excessive resources,\nleading to a denial of service. (CVE-2026-23943)\n\nIt was discovered that the Erlang HTTP server incorrectly applied directory\naccess controls to CGI scripts served via script aliases. A remote attacker\ncould possibly use this issue to bypass authentication and access protected\nCGI scripts. (CVE-2026-28808)\n\nIt was discovered that the Erlang DNS resolver used predictable transaction\nIDs and did not randomize source ports. A remote attacker could possibly\nuse this issue to perform DNS cache poisoning attacks. This issue only\naffected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-28810)\n\nIt was discovered that Erlang did not verify the signatures of designated\nOCSP responder certificates. A remote attacker could possibly use this\nissue to forge OCSP responses and bypass certificate revocation checks.\nThis issue only affected Ubuntu 26.04 LTS. (CVE-2026-32144)\n\nIt was discovered that the Erlang SFTP server incorrectly handled file\nattribute changes on open file handles. An authenticated user could\npossibly use this issue to modify the attributes of files outside of the\nroot directory. (CVE-2026-32147)\n\nIt was discovered that Erlang incorrectly allowed non-CA certificates to\nact as intermediate certificate issuers. A remote attacker could possibly\nuse this issue to forge certificate chains. (CVE-2026-42789)\n\nIt was discovered that Erlang incorrectly handled DNS name constraints\nduring hostname verification. A remote attacker could possibly use this\nissue to bypass certificate validation. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 26.04 LTS. (CVE-2026-42790)\n\nIt was discovered that Erlang did not check the validity period of OCSP\nresponder certificates. A remote attacker could possibly use this issue to\nforge OCSP responses using an expired responder certificate. This issue\nonly affected Ubuntu 26.04 LTS. (CVE-2026-42791)\n\nIt was discovered that Erlang incorrectly handled relative paths when\nextracting zip archives. An attacker could possibly use this issue to write\narbitrary files outside of the intended directory. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 26.04 LTS. (CVE-2026-47078)\n\nIt was discovered that the Erlang SFTP server exposed absolute paths when\nreading symbolic links. An authenticated user could possibly use this issue\nto obtain sensitive information. (CVE-2026-48855)\n\nIt was discovered that the Erlang HTTP client forwarded authorization\nheaders on cross-origin redirects. A malicious HTTP server could possibly\nuse this issue to obtain sensitive information. (CVE-2026-48856)\n\nIt was discovered that the Erlang FTP client did not validate the IP\naddress in passive mode responses. A malicious FTP server could possibly\nuse this issue to perform server-side request forgery attacks.\n(CVE-2026-48858)\n\nIt was discovered that Erlang checked the local address instead of the peer\naddress when enforcing the allowlist for distribution over TLS. A remote\nattacker could possibly use this issue to bypass access restrictions. This\nissue only affected Ubuntu 26.04 LTS. (CVE-2026-48860)\n\nIt was discovered that Erlang incorrectly handled certain SCTP ERROR\nchunks, leading to a buffer overflow. A remote attacker could possibly use\nthis issue to cause Erlang to crash, resulting in a denial of service.\n(CVE-2026-49759)\n\nIt was discovered that the Erlang erl_interface library incorrectly handled\nprinting very large integers, leading to a buffer overflow. An attacker\ncould possibly use this issue to cause Erlang to crash or execute arbitrary\ncode. (CVE-2026-49760)\n\nIt was discovered that the Erlang SFTP server incorrectly handled certain\npath resolution requests. An authenticated user could possibly use this\nissue to determine the existence of files outside of the root directory.\n(CVE-2026-53422)\n\nIt was discovered that the Erlang SFTP server incorrectly handled extended\nchannel data, leading to an infinite loop. An authenticated user could\npossibly use this issue to cause a denial of service. (CVE-2026-54886)\n\nIt was discovered that the Erlang DTLS server used a predictable cookie\nsecret on startup. A remote attacker could possibly use this issue to\nbypass source address verification. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 26.04 LTS. (CVE-2026-54887)\n\nIt was discovered that Erlang TLS clients incorrectly accepted application\ndata before the handshake was completed. A remote attacker could possibly\nuse this issue to inject arbitrary data into TLS connections.\n(CVE-2026-54891)\n\nIt was discovered that the Erlang DTLS server contained a race condition\nwhen handling rapid client reconnections. A remote attacker could possibly\nuse this issue to cause Erlang to crash, resulting in a denial of service.\nThis issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n(CVE-2026-55950)\n\nIt was discovered that Erlang did not properly validate TLS 1.3 pre-shared\nkey extensions. A remote attacker could possibly use this issue to cause\nErlang to crash, resulting in a denial of service. This issue only affected\nUbuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-55952)\n\nIt was discovered that the Erlang ASN.1 decoder incorrectly handled certain\nobject identifiers. A remote attacker could possibly use this issue to\ncause Erlang to use excessive resources, leading to a denial of service.\n(CVE-2026-65634)\n\nIt was discovered that the Erlang SSH server did not properly limit the\nnumber of open channels. An authenticated user could possibly use this\nissue to cause Erlang to use excessive resources, leading to a denial of\nservice. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nUbuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-68956)\n\nIt was discovered that the Erlang HTTP server incorrectly shared users and\ngroups between directories when using dets or mnesia authentication\nbackends. A remote attacker could possibly use this issue to bypass\nauthentication and access protected directories. (CVE-2026-74994)\n\nIt was discovered that Erlang TLS clients incorrectly accepted unsolicited\nTLS 1.3 pre-shared keys from servers. A remote attacker could possibly use\nthis issue to impersonate servers. This issue only affected\nUbuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-89422)","status":"published","published":"2026-10-08T12:01:56Z","modified":"2026-10-08T19:58:53.589918012Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}