CVE-2026-62672: Grav: Authenticated ReDoS via regex_replace in Twig Sandbox

September 2, 2026 (updated September 17, 2026)

The regex_replace filter and function are allowlisted in Grav’s Twig content sandbox. When Twig processing in page content is enabled security.twig_content.process_enabled: true, authenticated page editors can supply a catastrophically backtracking PCRE pattern, causing unbounded CPU consumption and denying service to the entire web server process.

References

github.com/advisories/GHSA-37f3-6p89-6qr9
github.com/getgrav/grav/commit/907116268ad4f48be7472c57f64981918578599a
github.com/getgrav/grav/releases/tag/2.0.4
github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9
nvd.nist.gov/vuln/detail/CVE-2026-62672

Code Behaviors & Features

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