CVE-2026-45372
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's se
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value.
This vulnerability is fixed in 0.44.0.
CRITICAL · CVSS 9.9
EPSS 0.00043
Schedule remediation
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0