CVE-2026-34441
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.
- Affected products
- Cpp-Httplib
- Yhirose Cpp-httplib
- < 0.40.0
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.2% (10th percentile)
- Weakness
- CWE-444
- NVD status
- Analyzed
- Published
- 2026-03-31
No indexed exploits for CVE-2026-34441 yet
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