{"id":"CVE-2026-45133","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45133","generatedAt":"2026-10-28T02:18:27.082Z","title":"Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping())…","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, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. 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":"2026-07-15T14:54:50.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.2,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:P/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-674","CWE-776","CWE-1333"],"affected":["sensiolabs/symfony"],"epss":{"score":0.0063,"percentile":0.49892,"date":"2026-10-26","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 (0.63%). 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/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-c2p3-7m5p-cv8x","tags":["Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45133","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."}