CVE-2025-55181: proxygen — Fix

Description

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.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-834 CWE-834

Affected Products

Vendor	Product	Versions
facebook	proxygen	2025.08.25.00 — 2025.12.01.00

References

Advisories & Patches

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-55181? +

CVE-2025-55181 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-55181? +

CVE-2025-55181 affects products from facebook, specifically: proxygen. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55181? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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