{"id":"UBUNTU-CVE-2026-69246","details":"Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1.","modified":"2026-08-06T00:23:23Z","published":"2026-08-03T21:16:00Z","upstream":["CVE-2026-69246"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-69246"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-69246"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/pull/3907"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/pull/3908"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/releases/tag/7.15.2"},{"type":"REPORT","url":"https://github.com/guzzle/guzzle/releases/tag/8.0.1"}],"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-2026-69246.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_name":"php-guzzlehttp-guzzle","binary_version":"7.9.2-0.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69246.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}