CVE-2026-45372

Name	CVE-2026-45372
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cpp-httplib (PTS)	bookworm	0.11.4+ds-1+deb12u1	vulnerable
	trixie (security), trixie	0.18.7-1+deb13u1	vulnerable
	forky, sid	0.41.0+ds-3	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cpp-httplib	source	(unstable)	(unfixed)

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m