VULNERABILITY INTELLIGENCE

CVE-2026-33745

CVSS score7.4 HIGH
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-03-27
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-httplib HTTP client forwards stored Basic Auth, Bearer Token, and Digest Auth credentials to arbitrary hosts when following cross-origin HTTP redirects (301/302/307/308). A malicious or compromised server can redirect the client to an attacker-controlled host, which then receives the plaintext credentials in the `Authorization` header. Version 0.39.0 fixes the issue.

Weakness classification

  • security-advisories@github.com: CWE-200
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references