VDB
CVE-2026-34441
CVE-2026-34441
PUBLISHED
CVSS 4.800000190734863 MEDIUM
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.
EPSS 0.20% · 9.2th percentile
Risk Scores
CVSS 3.1
4.800000190734863
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS Score
0.20%
9.2th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| yhirose | cpp-httplib | < 0.40.0, 0 |
Timeline
- Mar 31, 2026 CVE Published
- Mar 31, 2026 PoC Published
- Apr 1, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
- May 26, 2026 EPSS Score