CVE-2026-45372
Critical · 9.9CVSS
9.9
EPSS
0.4%
Published
May 29, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | cpp-httplib | 0 | 0.46.1-1.1 |
Related vulnerabilities
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- CVE-2026-28434 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-28435 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
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