CVE-2026-33745

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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-27 | Updated 2026-04-01 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

References

github.com/...ttplib/security/advisories/GHSA-6hrp-7fq9-3qv2

cve.org (CVE-2026-33745)

nvd.nist.gov (CVE-2026-33745)

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