{"id":"CVE-2026-67353","title":"guzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions","summary":"guzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions. Attackers can return many large cookies from a malicious serve…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-770"],"vendor":"guzzle","product":"guzzle","affected":["guzzle < 7.15.1"],"published":"2026-08-01","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:32.600","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67353","references":[{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-03T18:17:41.542665Z"},"epss":0.00418,"epssPercentile":0.35925,"ingestedAt":"2026-08-02T09:18:11.766Z","slug":"CVE-2026-67353","body":"## Overview\n\nguzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions. Attackers can return many large cookies from a malicious server, causing Guzzle to store excessive data in memory and generate oversized Cookie headers that fail in handlers or destination servers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}