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CVE-2026-45372

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

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
yhirose / cpp-httplibaffected < 0.44.0

CWE

CWE-93, CWE-444

References

ADP enrichment

CISA-ADP

No English description supplied.