cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection
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…
Severity critical: primary CNA CVSS 9.9 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-05-29T19:21:12.313Z. Updated 2026-06-01T17:57:44.116Z.