CVE-2026-12611
published 2026-09-08CVE-2026-12611: 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…
PriorityP349high8.7CVSS 4.0
AVNACLATNPRNUINVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.25%
15.8th percentile
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.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| eclipse_foundation | eclipse_jetty | 10.0.0 – 10.0.31 | — |
| eclipse_foundation | eclipse_jetty | 11.00 – 11.0.31 | — |
| eclipse_foundation | eclipse_jetty | 12.0.0 – 12.0.37 | — |
| eclipse_foundation | eclipse_jetty | 12.1.0 – 12.1.10 | — |
| eclipse_foundation | eclipse_jetty | 9.4.36 – 9.4.63 | — |
| jenkins | jenkins | — | — |
| ocp-tools-4 | jenkins-rhel8 | — | — |
| ocp-tools-4 | jenkins-rhel9 | — | — |
| offline-knowledge-portal | rhokp-rhel9 | — | — |
| opendaylight | opendaylight | — | — |
| redhat-user-workloads | rhokp-core-encrypted | — | — |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.7HIGH
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GHSA
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.
ghsa_unreviewed·2026-09-08
CVE-2026-12611 [HIGH] CWE-400 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.
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.
Red Hat
org.eclipse.jetty.http2/http2-common: org.eclipse.jetty.http2/jetty-http2-common: Jetty: Denial of Service via HTTP/2 race condition
vendor_redhat·2026-09-08·CVSS 8.7
CVE-2026-12611 [HIGH] CWE-367 org.eclipse.jetty.http2/http2-common: org.eclipse.jetty.http2/jetty-http2-common: Jetty: Denial of Service via HTTP/2 race condition
org.eclipse.jetty.http2/http2-common: org.eclipse.jetty.http2/jetty-http2-common: Jetty: Denial of Service via HTTP/2 race condition
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.
A flaw was found in Jetty. A remote attacker can exploit a race
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-12611 jetty: Jetty: Denial of Service via HTTP/2 race condition [fedora-all]
bugzilla·2026-09-21·CVSS 8.7
CVE-2026-12611 [HIGH] CVE-2026-12611 jetty: Jetty: Denial of Service via HTTP/2 race condition [fedora-all]
CVE-2026-12611 jetty: Jetty: Denial of Service via HTTP/2 race condition [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 h
Bugzilla
CVE-2026-12611 Jetty: Jetty: Denial of Service via HTTP/2 race condition
bugzilla·2026-09-08·CVSS 8.7
CVE-2026-12611 [HIGH] CVE-2026-12611 Jetty: Jetty: Denial of Service via HTTP/2 race condition
CVE-2026-12611 Jetty: Jetty: Denial of Service via HTTP/2 race condition
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.
2026-09-08
Published