HTTP Request Smuggling Affecting cpp-httplib package, versions <0.41.0+ds-3


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.2% (10th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-CPPHTTPLIB-15907603
  • published5 Apr 2026
  • disclosed31 Mar 2026

Introduced: 31 Mar 2026

CVE-2026-34441  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade Debian:unstable cpp-httplib to version 0.41.0+ds-3 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 Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1