libcpp-httplib0: cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library
CVE-2026-45372 is fixed in 6 products on 1 platform, first by libcpp-httplib0.26 0.26.0+ds-2ubuntu3+esm1, released May 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cpp-httplib · Fedora 43 | 0.48.0-1.fc43 | FEDORA-2026-1D4BD0354A | Jun 24, 2026 |
| cpp-httplib-devel · Fedora 43 | 0.48.0-1.fc43 | FEDORA-2026-1D4BD0354A | Jun 24, 2026 |
| libcpp-httplib0 · Ubuntu 22.04.1 LTS (jammy) | 0.10.3+ds-1ubuntu0.1~esm2 | libcpp-httplib0 0.10.3+ds-1ubuntu0.1~esm2 | Jun 26, 2026 |
| libcpp-httplib0.14t64 · Ubuntu 24.04.5 LTS (noble) | 0.14.3+ds-1.1ubuntu0.1~esm2 | libcpp-httplib0.14t64 0.14.3+ds-1.1ubuntu0.1~esm2 | Jun 26, 2026 |
| libcpp-httplib0.18 · Ubuntu 25.10 (questing) | 0.18.7-1ubuntu0.25.10.2 | libcpp-httplib0.18 0.18.7-1ubuntu0.25.10.2 | Jun 26, 2026 |
| libcpp-httplib0.26 · Ubuntu 26.04.1 LTS (resolute) | 0.26.0+ds-2ubuntu3+esm1 | libcpp-httplib0.26 0.26.0+ds-2ubuntu3+esm1 | May 29, 2026 |
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