Is CVE-2026-62237 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-62237 being exploited in the wild.

How severe is CVE-2026-62237?

Medium severity, with a CVSS score of 6.5, published 17 July 2026.

Which products and versions are affected?

Grav before 2.0.4; getgrav/grav (Packagist) ECOSYSTEM:introduced=0,fixed=2.0.4.

Is there a fix for CVE-2026-62237?

Yes. getgrav/grav (Packagist): upgrade to 2.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-62237 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-62237?

Check whether you run Grav or getgrav/grav (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-62237: Grav ReDoS in Twig sandbox regex_replace filter

CVE-2026-62237 · Severity: medium · CVSS 6.5 · Published 2026-07-17

Grav, a popular open-source content management system, is vulnerable to a denial-of-service attack. An authenticated user with permission to edit pages can submit a specially crafted text pattern that forces the server's processor to work indefinitely. This can lead to the entire website becoming unresponsive for all visitors, potentially causing a complete service outage.

Technologies: Grav, getgrav/grav (Packagist). Vendors: Grav, Packagist.

Quick answers

Is CVE-2026-62237 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-62237 being exploited in the wild.
How severe is CVE-2026-62237?: Medium severity, with a CVSS score of 6.5, published 17 July 2026.
Which products and versions are affected?: Grav before 2.0.4; getgrav/grav (Packagist) ECOSYSTEM:introduced=0,fixed=2.0.4.
Is there a fix for CVE-2026-62237?: Yes. getgrav/grav (Packagist): upgrade to 2.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-62237 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-62237?: Check whether you run Grav or getgrav/grav (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

getgrav/grav (Packagist): upgrade to 2.0.4 or later
```
composer require getgrav/grav:^2.0.4
```

Technical details

A Regular Expression Denial of Service (ReDoS) vulnerability exists in Grav's Twig content sandbox due to the allowlisting of the 'regex_replace' filter and function. The underlying implementation in GravExtension.php passes user-supplied patterns directly to PHP's preg_replace() without complexity validation. If 'security.twig_content.process_enabled' is set to true, an authenticated attacker with page-editing privileges can embed a catastrophic backtracking PCRE pattern in page content. This results in exponential time complexity during processing, exhausting CPU resources and causing a denial of service (DoS) for the web server process. The issue is fixed in version 2.0.4.

Affected products

getgrav Grav before 2.0.4

Identifiers

CVE-2026-62237
GHSA-37f3-6p89-6qr9

Timeline

2026-06-29: advisory: Initial GitHub security advisory published
2026-07-17: disclosed: NVD publication date

References

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