CRLF Injection Affecting cpp-httplib package, versions <0.18.7-1ubuntu0.25.10.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2510-CPPHTTPLIB-17116957
- published25 Jun 2026
- disclosed29 May 2026
Introduced: 29 May 2026
CVE-2026-45372 (opens in a new tab)How to fix?
Upgrade Ubuntu:25.10 cpp-httplib to version 0.18.7-1ubuntu0.25.10.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream cpp-httplib package and not the cpp-httplib package as distributed by Ubuntu.
See How to fix? for Ubuntu:25.10 relevant fixed versions and status.
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.