CVE-2026-22776: Yhirose Cpp-Httplib

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Yhirose Cpp-Httplib: before 0.30.1 (fixed in 0.30.1)

Published 2026-01-12. Last modified 2026-06-17.