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CVE-2026-67354 is an information disclosure vulnerability in guzzlehttp/guzzle versions prior to 7.15.1. The issue resides in RedirectMiddleware when the optional allow_redirects.referer setting is enabled. During same-scheme redirects, such as HTTPS-to-HTTPS, the middleware generates a Referer header for the follow-up request and incorrectly includes the URI fragment from the original request. Because URI fragments commonly carry client-side secrets such as one-time login values, access tokens, or state parameters, a redirect target controlled by an attacker can receive sensitive data that should never be transmitted in HTTP headers. Version 7.15.1 corrects this behavior by stripping the fragment before constructing the Referer value.
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Cross-references every affected SKU, including bundled OEM variants.
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