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Inefficient Regular Expression Complexity

CVE-2026-45305

High
8.7/10

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to version 5.4.52, 6.x prior to 6.4.40, 7.x prior to 7.4.12 and 8.x prior to 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.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-1333 - Inefficient Regular Expression Complexity

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

References

Advisory Timeline

  • Published