CVE-2026-45305

HIGH8.7

Symfony: YAML Parser ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex

Published Jul 14, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb

WEB

https://github.com/symfony/symfony/releases/tag/v5.4.52

WEB

https://github.com/symfony/symfony/releases/tag/v6.4.40

WEB

https://github.com/symfony/symfony/releases/tag/v7.4.12

WEB

https://github.com/symfony/symfony/releases/tag/v8.0.12

WEB