{"id":"CVE-2026-107284","aliases":["DEBIAN-CVE-2026-107284","EUVD-2026-94644","GHSA-rwhr-j9rv-85f8","UBUNTU-CVE-2026-107284"],"status":"published","title":"AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00138,"percentile":0.0324,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345","CWE-670"],"published":"2026-10-07T21:27:03Z","modified":"2026-10-28T10:51:09Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.3-1","2.12.3-1+deb12u1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.5-1","1.6.5-2","1.6.5-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.5-4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.5-4","1.6.5-5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.0-1","2.6.0-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.2-1","2.12.3-1","2.12.3-1ubuntu0.22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.3-1","2.12.3-1ubuntu0.24.04.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.3-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.3-1","2.12.3-1ubuntu1","2.12.3-1ubuntu1.1"]}],"products":[{"vendor":"asynchttpclient","product":"async-http-client"}],"references":[{"url":"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8","tags":["x_refsource_CONFIRM","advisory","report"]},{"url":"https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107284.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107284","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-107284","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-107284","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107284","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-107284","title":"AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:27:03.257Z","modified":"2026-10-08T14:54:57.517Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-345","CWE-670"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-94644","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:27:03Z","modified":"2026-10-08T14:54:57Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T17:27:32.642438Z"}],"nvd":[{"id":"CVE-2026-107284","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:04.483Z","modified":"2026-10-08T20:35:31.2Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-345","CWE-670"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"CVE-2026-107284","title":"AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:27:03.257Z","modified":"2026-10-28T10:51:09.306674337Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-345","CWE-670"],"updated_at":"2026-11-02T15:44:54.933106Z"},{"id":"DEBIAN-CVE-2026-107284","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:04.483Z","modified":"2026-10-12T19:47:30.507867207Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:49.381767Z"},{"id":"UBUNTU-CVE-2026-107284","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:00Z","modified":"2026-10-17T12:59:47.242549019Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}