CVE-2026-119237
What it is
In proxygen's HTTP/3 session, when a HEADERS block referenced QPACK dynamic table entries that had not yet been received, header decoding for that stream was paused, but the session continued to read the stream from the QUIC transport. The unread data bypassed the session's ingress buffer limit, returned flow-control credit to the peer, and was re-scanned in full on every read. With QPACK blocked streams enabled (the default), a remote, unauthenticated HTTP/3 peer could send a HEADERS block that references a dynamic table insert it never sends, followed by a continuous stream of data, causing memory growth until the request timed out and CPU usage that grows quadratically, leading to denial of service. This issue affects proxygen versions prior to v2026.11.09.00.
At a glance
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: not scored yet.
- Severity: not scored yet.
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Record status
- Deferred
Is it in your code?
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Read https://cve-list.com/agent/cve/CVE-2026-119237.md and follow it. Check whether this project is affected by CVE-2026-119237. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
