HTTP::Tiny versions before 0.095 for Perl forward credential headers to cross-origin redirect targets.
When the server returns a 3xx redirect, _maybe_redirect follows the Location: header and _prepare_headers_and_cb re-merges the callers headers argument into the new request, without checking whether the redirect target shares an origin with the original URL. Caller-supplied Authorization, Cookie and Proxy-Authorization headers are therefore re-sent to whatever host the redirect names, across scheme, host or port boundaries, and including https to http downgrades that expose them in plaintext on the wire.
The HTTP::Tiny POD note that Authorization headers will not be included in a redirected request applied only to the URL-userinfo Basic-auth path, not to headers passed explicitly by the caller.
Weakness
The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/102.html
- https://cwe.mitre.org/data/definitions/474.html
- https://cwe.mitre.org/data/definitions/50.html
- https://cwe.mitre.org/data/definitions/509.html
- https://cwe.mitre.org/data/definitions/551.html
- https://cwe.mitre.org/data/definitions/555.html
- https://cwe.mitre.org/data/definitions/560.html
- https://cwe.mitre.org/data/definitions/561.html
- https://cwe.mitre.org/data/definitions/600.html
- https://cwe.mitre.org/data/definitions/644.html
- https://cwe.mitre.org/data/definitions/645.html
- https://cwe.mitre.org/data/definitions/652.html
- https://cwe.mitre.org/data/definitions/653.html
References
- https://github.com/Perl-Toolchain-Gang/HTTP-Tiny/commit/84984ef3930ddd4afcf5eb83b40d3cee200739c3.patch
- https://github.com/Perl-Toolchain-Gang/HTTP-Tiny/commit/8f32ca89e21c3ad0422adc698fa6ad17a193f55f.patch
- https://github.com/Perl-Toolchain-Gang/HTTP-Tiny/commit/e7a03aedf2395158f2b0d3bad2df943349227bb3.patch
- https://github.com/Perl-Toolchain-Gang/HTTP-Tiny/pull/36
- https://metacpan.org/release/HAARG/HTTP-Tiny-0.095-TRIAL/changes
- http://www.openwall.com/lists/oss-security/2026/07/07/13