CVE-2026-45305 — Symfony: YAML Parser ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex

2026-10-07T03:03:47.059533+00:00

Affected: symfony, symfony yaml

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.

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CVE-2026-45305 — Symfony: YAML Parser ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex