CVE-2026-33745 — cpp-httplib Client Leaks Authentication Credentials to Untrusted Hosts on Cross-Origin HTTP Redirect

CVE-2026-33745

cpp-httplib Client Leaks Authentication Credentials to Untrusted Hosts on Cross-Origin HTTP Redirect PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
yhirose / cpp-httplib	affected < 0.39.0

CWE

CWE-200

References

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-6hrp-7fq9-3qv2

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.