---
id: CVE-2026-62237
title: >-
  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
summary: >-
  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
  (securit…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1333
vendor: getgrav
product: grav
affected:
  - grav < 2.0.4
published: '2026-07-17'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:27.103'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62237'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/grav-redos-via-regex-replace-in-sandbox
    label: disclosure@vulncheck.com
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-21T01:22:23.036235Z'
epss: 0.00436
epssPercentile: 0.35797
ingestedAt: '2026-10-08T16:52:14.702Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.