CVE-2026-45372 | BDVDB-2026-336583 Detail

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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Exploit#

History#

1. Version 12026-05-29Record published in the CVE List.
2. Version 22026-06-01Most recent update recorded in the CVE List.