CVE-2026-45372 - cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection

CVE ID :CVE-2026-45372 Published : May 29, 2026, 8:16 p.m. | 2 hours, 8 minutes ago 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. Severity: 9.9 | CRITICAL Visit the link for more details, such as CVSS details, affected products, timeline, and more...