{"id":"CVE-2026-69246","title":"Guzzle is an extensible PHP HTTP client","summary":"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 H…","severity":"high","cvss":7.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-180","CWE-436","CWE-918","CWE-941"],"vendor":"guzzlehttp","product":"guzzlehttp/guzzle","affected":["guzzlehttp/guzzle < 7.15.2","guzzlehttp/guzzle >= 8.0.0, < 8.0.1"],"patched":["guzzlehttp/guzzle 7.15.2","guzzlehttp/guzzle 8.0.1"],"published":"2026-08-03","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:41:31.497","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-69246","references":[{"url":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/pull/3907","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/pull/3908","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/releases/tag/7.15.2","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/releases/tag/8.0.1","label":"security-advisories@github.com"},{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-v5mv-p594-2x33"}],"tags":["nvd","ghsa","composer"],"epss":0.00213,"epssPercentile":0.11926,"aliases":["GHSA-v5mv-p594-2x33"],"ecosystem":"composer","ingestedAt":"2026-08-03T21:30:01.478Z","slug":"CVE-2026-69246","body":"## Overview\n\nGuzzle 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-69246)\n\nAffected packages:\n\n- `guzzlehttp/guzzle < 7.15.2`\n- `guzzlehttp/guzzle >= 8.0.0, < 8.0.1`\n\nPatched in:\n\n- `guzzlehttp/guzzle 7.15.2`\n- `guzzlehttp/guzzle 8.0.1`\n\nSource: https://github.com/advisories/GHSA-v5mv-p594-2x33","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":39.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}