{"id":"CVE-2026-45305","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45305","generatedAt":"2026-10-28T05:59:26.846Z","title":"Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\\Component\\Yaml\\Parser::cleanup() used regular expressions with overlapping quantifiers for YAML directive, comment, and document marker cleanup, allowing crafted input to make parsing hang for an…","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\\Component\\Yaml\\Parser::cleanup() used regular expressions with overlapping quantifiers for YAML directive, comment, and document marker cleanup, allowing crafted input to make parsing hang for an arbitrarily long time. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.","published":"2026-07-14T19:17:07.000Z","lastModified":"2026-07-15T14:57:03.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1333"],"affected":["sensiolabs/symfony"],"epss":{"score":0.00684,"percentile":0.52371,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v5.4.52","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v6.4.40","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v7.4.12","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v8.0.12","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m","tags":["Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45305","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}