Symfony: YAML Parser ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.8%
exploitation probability
0.8%top 47% of all CVEs
observed exploitation
nono source reports it
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.
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
References
https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cbhttps://github.com/symfony/symfony/releases/tag/v5.4.52https://github.com/symfony/symfony/releases/tag/v6.4.40https://github.com/symfony/symfony/releases/tag/v7.4.12https://github.com/symfony/symfony/releases/tag/v8.0.12https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m