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Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
GitHub PoC Links
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CVE
CVE-2026-45372
Severity
CRITICAL
CVSS
9.9
EPSS
0.29%
Original NVD 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.