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CVE-2026-46527

7.5 HIGH

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library

Published: 2026-05-29 · Last updated: 2026-06-01

Severity and scoring

CVSS
7.5 HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-476

Affected products

VendorProduct
yhirosecpp-httplib

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0.

Source: NVD

References

Related CVEs

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  • CVE-2026-45372 — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library (9.9 CRITICAL)
  • CVE-2026-45352 — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library (5.3 MEDIUM)

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