{"id":"CVE-2026-93569","aliases":["DEBIAN-CVE-2026-93569","EUVD-2026-82945","GHSA-xx86-5ch4-942v","SUSE-SU-2026:4391-1","UBUNTU-CVE-2026-93569","openSUSE-SU-2026:11882-1"],"status":"published","title":"Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.02417,"percentile":0.84362,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-444"],"published":"2026-09-18T14:27:54Z","modified":"2026-11-06T17:12:30Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16","1:4.1.48-7","1:4.1.48-7+deb12u1","1:4.1.48-7+deb12u2","1:4.1.48-8","1:4.1.48-9"]},{"source":"osv","ecosystem":"Debian:13","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-10+deb13u1","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16"]},{"source":"osv","ecosystem":"Debian:14","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16"]},{"source":"osv","ecosystem":"SUSE:Linux 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7"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69440","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69470","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70257","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:83612","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95221","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95759","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95760","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95761","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95762","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-93569","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536962","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93569"},{"url":"https://github.com/advisories/GHSA-xx86-5ch4-942v"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93569","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264391-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1275500","tags":["report"]},{"url":"https://bugzilla.suse.com/1275501","tags":["report"]},{"url":"https://bugzilla.suse.com/1276420","tags":["report"]},{"url":"https://bugzilla.suse.com/1276421","tags":["report"]},{"url":"https://bugzilla.suse.com/1276455","tags":["report"]},{"url":"https://bugzilla.suse.com/1276456","tags":["report"]},{"url":"https://bugzilla.suse.com/1277243","tags":["report"]},{"url":"https://bugzilla.suse.com/1280048","tags":["report"]},{"url":"https://bugzilla.suse.com/1281431","tags":["report"]},{"url":"https://bugzilla.suse.com/1281432","tags":["report"]},{"url":"https://bugzilla.suse.com/1281433","tags":["report"]},{"url":"https://bugzilla.suse.com/1281434","tags":["report"]},{"url":"https://bugzilla.suse.com/1281435","tags":["report"]},{"url":"https://bugzilla.suse.com/1282084","tags":["report"]},{"url":"https://bugzilla.suse.com/1282085","tags":["report"]},{"url":"https://bugzilla.suse.com/1282132","tags":["report"]},{"url":"https://bugzilla.suse.com/1282140","tags":["report"]},{"url":"https://bugzilla.suse.com/1282141","tags":["report"]},{"url":"https://bugzilla.suse.com/1282362","tags":["report"]},{"url":"https://bugzilla.suse.com/1282363","tags":["report"]},{"url":"https://bugzilla.suse.com/1282364","tags":["report"]},{"url":"https://bugzilla.suse.com/1282366","tags":["report"]},{"url":"https://bugzilla.suse.com/1282367","tags":["report"]},{"url":"https://bugzilla.suse.com/1282370","tags":["report"]},{"url":"https://bugzilla.suse.com/1282372","tags":["report"]},{"url":"https://bugzilla.suse.com/1282373","tags":["report"]},{"url":"https://bugzilla.suse.com/1282374","tags":["report"]},{"url":"https://bugzilla.suse.com/1282378","tags":["report"]},{"url":"https://bugzilla.suse.com/1282506","tags":["report"]},{"url":"https://bugzilla.suse.com/1282507","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59902","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59903","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62243","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62380","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-75595","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-75596","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-76816","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-89044","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93488","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93491","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93492","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93493","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93558","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93560","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93562","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93563","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93564","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93565","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93566","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93567","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93568","t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http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","status":"published","published":"2026-09-18T14:27:54.015Z","modified":"2026-11-06T17:12:30.642Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-06T18:59:09.209977Z"}],"euvd":[{"id":"EUVD-2026-82945","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. 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A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","status":"published","published":"2026-09-18T15:17:20.743Z","modified":"2026-11-06T17:20:05.39Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-06T20:01:13.550593Z"}],"osv":[{"id":"DEBIAN-CVE-2026-93569","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","status":"published","published":"2026-09-18T15:17:20.743Z","modified":"2026-11-07T09:47:36.304126798Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-07T10:14:19.880839Z"},{"id":"UBUNTU-CVE-2026-93569","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","status":"published","published":"2026-09-18T15:17:00Z","modified":"2026-10-17T13:01:18.376005298Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"openSUSE-SU-2026:11882-1","title":"netty-4.1.138-1.1 on GA media","description":"These are all security issues fixed in the netty-4.1.138-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-09-25T18:23:09.573141425Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"SUSE-SU-2026:4391-1","title":"Security update for netty, netty-tcnative","description":"This update for netty, netty-tcnative fixes the following issues:\n\n- CVE-2026-59902: Netty: Memory Exhaustion in SctpMessageCompletionHandler (bsc#1275501).\n- CVE-2026-59903: Netty Vulnerable to Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite\n  (bsc#1275500).\n- CVE-2026-62243: TLS hostname verification bypass in Netty OpenSSL client path (bsc#1276455).\n- CVE-2026-62380: null byte and CRLF injection in Socks4ClientEncoder and Socks5ClientEncoder (bsc#1276456).\n- CVE-2026-75595: fragmented TLS `ClientHello` causes fallback to default `SslContext` and allows for SNI routing and\n  mTLS requirement bypass (bsc#1276420).\n- CVE-2026-75596: fragmented `ClientHello`records can trigger quadratic pre-handshake reassembly in default SNI parsing\n  (bsc#1276421).\n- CVE-2026-76816: missing input validation in `MqttEncoder` allows for null-byte injection, topic hijacking, and ACL\n  bypassing (bsc#1277243).\n- CVE-2026-89044: HTTP request smuggling in Netty via improper validation of final Transfer-Encoding coding\n  (bsc#1280048).\n- CVE-2026-93488: Denial of Service via unbounded concurrent SPDY streams (bsc#1282084).\n- CVE-2026-93491: Denial of Service via unbounded HttpServerCodec HTTP/1.1 pipeline queue (bsc#1282085).\n- CVE-2026-93492: HTTP/2 HpackEncoder DoS with large table size (bsc#1282132).\n- CVE-2026-93493: missing `nextUpdate` field in OCSP responses leads to silent validation bypass (bsc#1281431).\n- CVE-2026-93494: ByteBuf Leak in StompSubframeDecoder When a Frame Body Is Never Terminated (bsc#1282506).\n- CVE-2026-93558: Unbounded Per-Connection Queue Growth in WebSocketServerExtensionHandler Leads to Denial of Service\n  (bsc#1282140).\n- CVE-2026-93560: STOMP codec content-length long-to-int truncation causes infinite decode loop DoS (bsc#1282141).\n- CVE-2026-93562: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282362).\n- CVE-2026-93563: unbounded multi-line response accumulation in `SmtpResponseDecoder` leads to memory exhaustion and a\n  DoS (bsc#1281432).\n- CVE-2026-93564: HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (bsc#1282363).\n- CVE-2026-93565: RtspDecoder Method-Token Smuggling via Trailing Control Byte (bsc#1282364).\n- CVE-2026-93566: HTTP Request Smuggling due to control characters in the chunk-size line (bsc#1282366).\n- CVE-2026-93567: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled\n  :authority (bsc#1282367).\n- CVE-2026-93568: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests (bsc#1282370).\n- CVE-2026-93569: HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target\n  authority (bsc#1282372).\n- CVE-2026-93572: multiplication of patched preallocation limits in `RedisArrayAggregator` nested RESP headers can lead\n  to denial of service (bsc#1281433).\n- CVE-2026-93573: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282373).\n- CVE-2026-93574: HTTP request smuggling via post-digit whitespace in chunk-size parsing (bsc#1282374).\n- CVE-2026-93575: missing validations in the `MqttDecoder` can lead to excessive resource consumption and a DoS\n  (bsc#1281434).\n- CVE-2026-93576: netty-codec-smtp -- SMTP command-name field is not CRLF-validated (bsc#1282507).\n- CVE-2026-93578: missing Extended Key Usage (EKU) check in OCSP client allows certificate revocation bypass\n  (bsc#1281435).\n- CVE-2026-93579: HTTP/2 header field values are not validated by default (bsc#1282378).\n\nChanges for netty:\n\n- Upgrade to upstream version 4.1.138\n\nChanges for netty-tcnative:\n\n- Upgrade to version 2.0.84 Final\n","status":"published","published":"2026-09-29T11:47:41Z","modified":"2026-09-30T12:00:04.604890726Z","updated_at":"2026-11-02T15:54:05.838224Z"}]}}