CVE-2025-55181

MEDIUM
5.3
CVSS Score
Published: December 2, 2025 at 10:13 PM UTC
Updated: October 18, 2026 at 05:10 PM UTC
1 product affected across 1 vendorProxygen

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2025.08.25.00 ≤ v ≤ 2025.12.01.002025.08.25.00

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMMeta
Vector?

Quick Info

StatusANALYZED
CWE
CWE-834

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