{"id":"CVE-2026-12611","title":"A client may issue HTTP/2 requests to a Jetty server that result in blocking writes that are never unblocked, eventually causing all threads to be blocked and the whole server to become unresponsive.\n\n\n\n\nThis is caused by a race conditio…","summary":"A client may issue HTTP/2 requests to a Jetty server that result in blocking writes that are never unblocked, eventually causing all threads to be blocked and the whole server to become unresponsive.\n\n\n\n\nThis is caused by a race conditio…","severity":"high","cvss":8.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-400","CWE-367"],"vendor":"Eclipse Foundation","product":"Eclipse Jetty","affected":["eclipse_jetty >= 12.1.0 <= 12.1.10","eclipse_jetty >= 12.0.0 <= 12.0.37","eclipse_jetty >= 11.00 <= 11.0.31","eclipse_jetty >= 10.0.0 <= 10.0.31","eclipse_jetty >= 9.4.36 <= 9.4.63"],"published":"2026-09-08","updated":"2026-09-09","sourceUpdated":"2026-09-09T11:17:12.777","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-12611","references":[{"url":"https://github.com/jetty/jetty.project/security/advisories/GHSA-gpg9-4257-cfm3","label":"emo@eclipse.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12611.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-12611"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529778"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-12611"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12611"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T13:22:30.453358Z"},"cvssSource":"cna","ingestedAt":"2026-09-08T15:33:26.983Z","epss":0.00253,"epssPercentile":0.17028,"scores":{"cna":8.7,"vendor":7.5},"slug":"CVE-2026-12611","body":"## Overview\n\nA client may issue HTTP/2 requests to a Jetty server that result in blocking writes that are never unblocked, eventually causing all threads to be blocked and the whole server to become unresponsive.\n\n\n\n\nThis is caused by a race condition in the server when handling RST_STREAM frames and GOAWAY frames sent by the client.\n\n\n\n\nThe race condition \"resets\" the HTTP2Flusher.terminated, previously set to a non-null value, to the null value, allowing entries to be enqueued in the flusher that however will never be processed. These unprocessed entries are the ones that would unblock the write-blocked threads.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: OpenShift Developer Tools and Services, Red Hat AMQ Broker 7, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry 3, Red Hat Fuse 7, Red Hat Offline Knowledge Portal, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12611.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}