{"id":"UBUNTU-CVE-2026-67354","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.","modified":"2026-08-06T00:23:23Z","published":"2026-08-01T13:17:00Z","upstream":["CVE-2026-67354"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-67354"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-67354"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"}],"affected":[{"package":{"name":"guzzle","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/guzzle?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.4.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-guzzlehttp-guzzle","binary_version":"7.4.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67354.json"}},{"package":{"name":"guzzle","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/guzzle?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.9.2-0.1","7.9.2-0.1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"7.9.2-0.1build1","binary_name":"php-guzzlehttp-guzzle"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67354.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}