CVE-2026-12611: CWE-400 Uncontrolled Resource Consumption in Eclipse Foundation Eclipse Jetty
Description
CVE-2026-12611 is a high-severity vulnerability in Eclipse Jetty where a race condition in HTTP/2 frame handling can cause server threads to become indefinitely blocked, leading to server unresponsiveness. The issue arises when the server processes RST_STREAM and GOAWAY frames, causing the HTTP2Flusher.terminated flag to be reset improperly. This allows entries to be enqueued that are never processed, blocking threads waiting on writes.
CVSS v4.0
Score 8.7high
Affected software
Eclipse Foundation
Eclipse Jetty
pkg:maven/org.eclipse.jetty/jetty-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a race condition in Eclipse Jetty's HTTP/2 implementation. When a client sends RST_STREAM and GOAWAY frames, the server resets the HTTP2Flusher.terminated flag from a non-null to null value, enabling entries to be enqueued in the flusher that are never processed. These unprocessed entries prevent the unblocking of write-blocked threads, eventually causing all server threads to block and the server to become unresponsive. The flaw affects multiple versions of Eclipse Jetty, specifically versions 9.4.36 through 9.4.63, 10.0.0 through 10.0.31, 11.0.0 through 11.0.31, 12.0.0 through 12.0.37, and 12.1.0 through 12.1.10.
Potential Impact
Successful exploitation results in uncontrolled resource consumption where server threads become indefinitely blocked, causing the entire Jetty server to become unresponsive. This denial of service condition can disrupt availability of services relying on the affected Jetty server versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider limiting or filtering HTTP/2 traffic from untrusted clients to reduce exposure to this race condition.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- eclipse
- Date Reserved
- 2026-06-18T11:34:22.081Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa00520acd9273b49ab156a
Added to database: 09/08/2026, 12:52:48 UTC
Last enriched: 09/16/2026, 02:46:00 UTC
Last updated: 10/22/2026, 13:15:20 UTC
Views: 78
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.