Medium severity · published Dec 2, 2025
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…
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PR
Proxygen · Facebook
2025.08.25.00 through 2025.12.01.00 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55181
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-55181
Patch
https://github.com/facebook/proxygen/commit/17689399ef99b7c3d3a8b2b768b1dba1a4b72f8f
Vendor Advisory
https://www.facebook.com/security/advisories/cve-2025-55181
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