CVE-2026-67354 guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer

guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allowredirects.referer setting is enabled, the middleware copies the URI fragment the portion after '' from the referring request into the generated Referer header whe...

CVE-2026-67354

The CVE-2026-67354 entry applies to guzzlehttp/guzzle prior to 7.15.1, where RedirectMiddleware can disclose the URI fragment via the Referer header when allow_redirects.referer is enabled during same-scheme redirects. An attacker controlling the redirect destination may obtain sensitive data (e....