{"id":"CVE-2026-67354","title":"guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware","summary":"guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') …","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-201"],"published":"2026-08-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:35:01.260","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67354","references":[{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00252,"epssPercentile":0.17,"ingestedAt":"2026-08-02T09:18:11.794Z","slug":"CVE-2026-67354","body":"## Overview\n\nguzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}