Unbounded Memory Growth Vulnerability in Proxygen by Facebook
CVE-2025-55181

5.3MEDIUM

Key Information:

Vendor

Facebook

Status
Proxygen
Vendor
CVE Published:
2 December 2025

What is CVE-2025-55181?

An issue exists in Proxygen, where sending an HTTP request or response body larger than 2^31 bytes results in an infinite loop within the proxygen::coro::HTTPQuicCoroSession. This behavior causes the backing event loop to be blocked, leading to unbounded memory growth as data continues to append unconditionally to a std::vector on each loop iteration. Ultimately, this can result in the process exhausting its available memory.

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Affected Version(s)

proxygen v2025.08.25.00

References

https://www.facebook.com/security/advisories/cve-2025-55181
x_refsource_CONFIRM
https://github.com/facebook/proxygen/commit/17689399ef99b...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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