{"id":"CVE-2026-128238","aliases":["DEBIAN-CVE-2026-128238","EUVD-2026-125054","GHSA-456h-w4v7-hvpr","GHSA-f6c2-ff6x-vmmq","UBUNTU-CVE-2026-128238"],"status":"published","title":"Scapy before 2.8.0 Uncontrolled Recursion DoS via BER SEQUENCE Decoder","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-15","score":0.00473,"percentile":0.4143,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2026-11-13T00:00:00Z","modified":"2026-11-14T15:00:07Z","fixes":[{"ecosystem":"Debian:14","package":"scapy","fixed_in":["2.8.0+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0+dfsg-2","2.5.0+git20240324.2b58b51+dfsg-1","2.5.0+git20240324.2b58b51+dfsg-2","2.6.0+dfsg-1","2.6.0+dfsg-2","2.6.1+dfsg-1","2.6.1+dfsg-2","2.6.1+dfsg-3","2.7.0+dfsg-1","2.7.0+dfsg1-1","2.8.0+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.1+dfsg-1","2.6.1+dfsg-2","2.6.1+dfsg-3","2.7.0+dfsg-1","2.7.0+dfsg1-1","2.8.0+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.0+dfsg-1"}]}],"versions":["2.6.1+dfsg-1","2.6.1+dfsg-2","2.6.1+dfsg-3","2.7.0+dfsg-1","2.7.0+dfsg1-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.3-1","2.3.3-3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.2-1","2.4.3-3","2.4.3-4"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.4-4ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0+dfsg-2","2.5.0+dfsg-2ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0+dfsg1-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"scapy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.1+dfsg-1","2.6.1+dfsg-3","2.7.0+dfsg-1","2.7.0+dfsg1-1"]}],"products":[{"vendor":"secdev","product":"scapy"}],"references":[{"url":"https://github.com/secdev/scapy/security/advisories/GHSA-456h-w4v7-hvpr","tags":["vendor-advisory","advisory","report"]},{"url":"https://www.vulncheck.com/advisories/scapy-before-2.8.0-uncontrolled-recursion-dos-via-ber-sequence-decoder","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128238","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f6c2-ff6x-vmmq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/128xxx/CVE-2026-128238.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-128238","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-128238","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-128238","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-128238","title":"Scapy before 2.8.0 Uncontrolled Recursion DoS via BER SEQUENCE Decoder","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T09:33:48.401Z","modified":"2026-11-13T22:31:14.151Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-674"],"updated_at":"2026-11-13T10:27:12.71329Z"}],"euvd":[{"id":"EUVD-2026-125054","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T09:33:48Z","modified":"2026-11-13T22:31:14Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-13T14:38:52.540051Z"}],"ghsa":[{"id":"GHSA-f6c2-ff6x-vmmq","title":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in...","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T12:31:40Z","modified":"2026-11-13T12:31:41Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-13T12:50:18.307659Z"}],"nvd":[{"id":"CVE-2026-128238","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T10:18:11.52Z","modified":"2026-11-13T23:17:18.11Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-674"],"updated_at":"2026-11-14T01:39:04.528785Z"}],"osv":[{"id":"CVE-2026-128238","title":"Scapy before 2.8.0 Uncontrolled Recursion DoS via BER SEQUENCE Decoder","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T09:33:48.401Z","modified":"2026-11-15T02:46:33.777181367Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-14T03:11:06.681237Z"},{"id":"DEBIAN-CVE-2026-128238","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T10:18:11.52Z","modified":"2026-11-14T15:00:07.1321457Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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":"medium"}],"updated_at":"2026-11-14T15:04:35.718414Z"},{"id":"UBUNTU-CVE-2026-128238","description":"Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.","status":"published","published":"2026-11-13T00:00:00Z","modified":"2026-11-13T21:05:26.996960234Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-13T21:30:20.292037Z"}]}}