# CVE-2025-55181: Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in…

Source: https://junglewise.ai/threats/cve-2025-55181-sending-an-http-request-response-body-with-greater-than-2-31  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-02  
License: CC BY 4.0 with a link back

CVE-2025-55181 · Severity: medium · CVSS 5.3 · Published 2025-12-02

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.

Technologies: [Facebook Proxygen](https://junglewise.ai/threats/technologies/proxygen). Vendors: [Facebook](https://junglewise.ai/threats/vendors/facebook).

## Quick answers

**Is CVE-2025-55181 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-55181 being exploited in the wild.

**How severe is CVE-2025-55181?** Medium severity, with a CVSS score of 5.3, published 2 December 2025.

**Which products and versions are affected?** Facebook Proxygen. The advisory does not name versions.

**Is there a fix for CVE-2025-55181?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-55181?** Check whether you run Facebook Proxygen. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Facebook Proxygen

## Related threats

- [Facebook Proxygen use-after-free in QuicWtSession closeSession](https://junglewise.ai/threats/cve-2026-84895-in-proxygen-from-v2026-04-06-00-until-v2026-09-28-00)
- [Facebook Proxygen denial of service via slow-consumer memory exhaustion](https://junglewise.ai/threats/cve-2026-44909-facebook-proxygen-denial-of-service-via-slow-consumer-memory)