{"id":"CVE-2026-81624","aliases":["DEBIAN-CVE-2026-81624","EUVD-2026-68411","GHSA-p4f9-3wx9-7g8r","UBUNTU-CVE-2026-81624"],"status":"published","title":"Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00582,"percentile":0.48282,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2026-08-31T08:47:51Z","modified":"2026-11-05T00:17:30Z","affected":[{"source":"osv","ecosystem":"Debian:14","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.11-1","1.3.16-1","1.3.19-1","1.3.21-1","1.3.23-1","1.3.4-1","1.3.5-1","1.3.7-1","1.4.0-1","1.4.1-1","1.4.18-1","1.4.20-1","1.4.21-1","1.4.21-2","1.4.22-1","1.4.23-1","1.4.23-2","1.4.23-3","1.4.25-1","1.4.25-2","1.4.3-1","1.4.4-1","1.4.6-1","1.4.7-1","1.4.8-1","2.0.23-1","2.0.25-1","2.0.26-1","2.0.27-1","2.0.28-1","2.0.29-1","2.0.30-1","2.1.0-1","2.1.1-1","2.1.3-1","2.2.0-1","2.2.10-1","2.2.12-1","2.2.13-1","2.2.14-1","2.2.16-1","2.2.17-1","2.2.18-1","2.2.19-1","2.2.2-1","2.2.20-1","2.2.21-1","2.2.3-1","2.2.4-1","2.2.5-1","2.2.8-1","2.3.18-1","2.3.18-2","2.3.20-1","2.3.8-1","2.3.8-2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.4-1","1.3.5-1","1.3.7-1","1.3.11-1","1.3.16-1","1.3.16-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.20-1","1.4.21-1","1.4.22-1","1.4.23-1","1.4.23-2build1","1.4.23-3","1.4.23-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.23-1","2.0.27-1","2.0.28-1","2.0.29-1","2.0.29-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.8-1","2.2.12-1","2.2.13-1","2.2.14-1","2.2.16-1","2.2.16-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.8-2","2.3.8-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.20-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"undertow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.18-2","2.3.20-1","2.3.20-1ubuntu1"]}],"products":[{"vendor":"red hat","product":"red hat build of apache camel for spring boot 4"},{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat fuse 7"},{"vendor":"red hat","product":"red hat jboss enterprise application platform 7"},{"vendor":"red hat","product":"red hat jboss enterprise application platform 8"},{"vendor":"red hat","product":"red hat jboss enterprise application platform expansion pack"},{"vendor":"red hat","product":"red hat single sign-on 7"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-81624","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2524868","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81624"},{"url":"https://github.com/advisories/GHSA-p4f9-3wx9-7g8r"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-81624","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-81624","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81624","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-81624","title":"Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T08:47:51.752Z","modified":"2026-09-10T07:15:29.95Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T13:36:29.327819Z"}],"euvd":[{"id":"EUVD-2026-68411","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T08:47:51Z","modified":"2026-09-10T07:15:29Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:25.63332Z"}],"ghsa":[{"id":"GHSA-p4f9-3wx9-7g8r","title":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in...","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T09:30:29Z","modified":"2026-08-31T09:30:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:11:10.774419Z"}],"nvd":[{"id":"CVE-2026-81624","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T09:17:03.453Z","modified":"2026-11-05T00:17:30.24Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-05T01:45:10.861521Z"}],"osv":[{"id":"DEBIAN-CVE-2026-81624","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T09:17:03.453Z","modified":"2026-11-05T09:47:32.681292559Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-05T13:31:24.64316Z"},{"id":"UBUNTU-CVE-2026-81624","description":"Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.","status":"published","published":"2026-08-31T09:17:00Z","modified":"2026-10-17T13:01:11.056482268Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"}]}}