proxygen HTTP/3 codec OOM/CPU DoS before 2026.11.09.00
CVE-2026-119233 Published on November 11, 2026
proxygen's HTTP/3 codec buffered an incomplete non-DATA frame, such as a control-stream frame, a frame of an unknown or reserved type, or a HEADERS frame, until its entire declared length had arrived, without limiting that length, and re-scanned all buffered data each time more bytes arrived. A remote, unauthenticated HTTP/3 peer could declare a very large frame and deliver it slowly, causing unbounded memory growth and CPU usage that grows quadratically with the number of fragments, leading to denial of service. This issue affects proxygen versions prior to v2026.11.09.00.
Products Associated with CVE-2026-119233
Want to know whenever a new CVE is published for Facebook Proxygen? stack.watch will email you.
Affected Versions
Facebook proxygen:- Version v0.0.0.0 and below v2026.11.09.00 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.