{"id":"GHSA-mqq9-gxg5-m58g","title":"Duplicate Advisory: Guzzle: URI fragments disclosed in redirect Referer headers","summary":"Duplicate Advisory: Guzzle: URI fragments disclosed in redirect Referer headers","severity":"high","cvss":5.9,"cwe":["CWE-201"],"vendor":"guzzlehttp","product":"guzzlehttp/guzzle","ecosystem":"composer","affected":["guzzlehttp/guzzle < 7.15.1"],"published":"2026-08-01","updated":"2026-08-04","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-mqq9-gxg5-m58g","references":[{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67354"},{"url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"},{"url":"https://github.com/advisories/GHSA-mqq9-gxg5-m58g"}],"tags":["ghsa","composer"],"ingestedAt":"2026-08-05T05:58:04.822Z","slug":"GHSA-mqq9-gxg5-m58g","body":"## Overview\n\n## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-h95v-h523-3mw8. This link is maintained to preserve external references.\n\n## Original Description\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## Affected packages\n\n- `guzzlehttp/guzzle < 7.15.1`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}