CVE-2026-45372EPSS p21.8%
CVE-2026-45372CVE-2026-45372
yhirose / cpp-httplib
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.
Scoring
| CVSS | 9.9 () |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L |
| EPSS | 0.29% probability of exploitation · percentile 21.8% · 2026-08-03T12:00:16Z |
| Last modified | 2026-07-22 |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.