CVE-2025-55181

Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in proxygen::coro::HTTPQuicCoroSession which blocks the backing event loop and unconditionally appends data to a std::vector per-loop iteration. This issue leads to unbounded memory growth and eventually causes the process to run out of memory.

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-25)

CWE

CWE-834

Published

2025-12-02

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• facebook:proxygen

References

• https://github.com/facebook/proxygen/commit/17689399ef99b7c3d3a8b2b768b1dba1a4b72f8f
• https://www.facebook.com/security/advisories/cve-2025-55181

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