CVE-2026-62237 Grav < 2.0.4 ReDoS via regex_replace in Sandbox
An authenticated page editor can cause denial of service via catastrophic regex backtracking in Grav CMS when Twig content processing is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-62237?
CVE-2026-62237 is a medium-severity denial of service vulnerability in getgrav grav, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-1333
Which versions are affected by CVE-2026-62237?
How do I fix CVE-2026-62237?
No fix has been published for CVE-2026-62237 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-62237 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62237 exists.
Sources
Also known as GHSA-6gqg-9qjp-56jm.