{"id":"CVE-2026-67354","aliases":["GHSA-h95v-h523-3mw8"],"url":"https://o3.security/vulnerability/CVE-2026-67354","summary":"guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer","details":"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 '#') 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.","published":"2026-08-01T12:22:18.324Z","modified":"2026-09-10T03:48:26.059459322Z","cvss":null,"epss":{"score":0.00252,"percentile":0.16806,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"guzzlehttp/guzzle","fixedVersion":"7.15.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67354.json"},{"type":"ADVISORY","url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67354"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:48:26.059459322Z"}}