Bug 2529778 (CVE-2026-12611)

Summary: CVE-2026-12611 Jetty: Jetty: Denial of Service via HTTP/2 race condition
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Jetty. A remote attacker can exploit a race condition in the server's handling of HTTP/2 RST_STREAM and GOAWAY frames. This can lead to blocking writes that are never unblocked, causing all server threads to become unresponsive. The primary impact is a Denial of Service (DoS) for the affected server.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2537321    
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Description OSIDB Bzimport 2026-09-08 13:07:59 UTC 
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.




This is caused by a race condition in the server when handling RST_STREAM frames and GOAWAY frames sent by the client.




The 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.