CVE-2026-45372

CriticalCVSS 9.9/10Last modified Jul 22, 2026

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.

Metrics

CVSS 3.1 9.9/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Weakness enumeration

CWE-93 CWE-444

Affected software

Vendor	Product	Versions
yhirose	cpp-httplib	< 0.44.0

References

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4mExploit, Mitigation, Vendor Advisory
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4mExploit, Mitigation, Vendor Advisory

Timeline

Published: May 29, 2026
Last modified: Jul 22, 2026
NVD status: Modified

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