Vulnerability in Getgrav Grav
CVE-2026-62237
Grav before 2.0.4 contains a regular expression denial of service (ReDoS) vulnerability in the regex_replace filter and function, which are allowlisted in the Twig content sandbox. When Twig processing in page content is enabled (security.twig_content.process_enabled: true, disabled by default), an authenticated page editor can supply a catastrophically backtracking PCRE pattern that is passed directly to PHP's preg_replace(), causing unbounded CPU consumption and denial of service to the web server process.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (21.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.001
Affected products
- Getgrav Grav — versions 0, 2.0.4
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9 (vendor-advisory)
- www.vulncheck.com/advisories/grav-redos-via-regex-replace-in-sandbox (third-party-advisory)
Frequently asked questions
- What is CVE-2026-62237?
- CVE-2026-62237 is a medium-severity vulnerability in Getgrav Grav, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-07-17.
- How severe is CVE-2026-62237?
- Medium severity. CVSS v3 base score is 6.5 out of 10.