Security Advisory

CVE-2026-45372

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-29 19:21:12

Last updated 2026-06-01 17:57:44

Assigner GitHub_M

CVSS score not scored

State PUBLISHED

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.

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