SEPTEMBER 17, 2026
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Case File

CVE-2026-12611

HIGH · CVSS 8.7 EPSS 0.25% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-08 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

A race condition in Jetty servers allows clients to send HTTP/2 requests that can lead to blocking writes, ultimately causing the server to become unresponsive as all threads are blocked. This vulnerability primarily affects any application utilizing Jetty for HTTP/2 communication and should be prioritized by organizations relying on Jetty for their web services to prevent service outages. Immediate remediation is essential to maintain operational integrity and availability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-12611
Severity
HIGH
CVSS
8.7
EPSS
0.25%

Original NVD Description

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.