CVE-2026-22776

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory.

Score

CVSS 4.0 8.7 High

Status

Analyzed - security-advisories@github.com

Published

2026-01-12

Last modified

2026-01-12

Weaknesses

CWE-409

Affected products

• Cpp-httplib (Yhirose)

References

• https://github.com/yhirose/cpp-httplib/commit/2e2e47bab1ae6a853476eecbc4bf279dd1fef792
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h934-98h4-j43q