CVE-2026-45133
Symfony: [Yaml] Harden the parser when handling untrusted input
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-674 CWE-776 CWE-1333 |
| Vendor | symfony |
| Product | symfony |
| Published | Jul 14, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
symfony / symfony
< 5.4.52 >= 6.0.0-BETA1, < 6.4.40 >= 7.0.0-BETA1, < 7.4.12 >= 8.0.0-BETA1, < 8.0.12
References
github.com: https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x github.com: https://github.com/symfony/symfony/releases/tag/v5.4.52 github.com: https://github.com/symfony/symfony/releases/tag/v6.4.40 github.com: https://github.com/symfony/symfony/releases/tag/v7.4.12 github.com: https://github.com/symfony/symfony/releases/tag/v8.0.12