TI-2026-44780 Aliases CVE-2026-62672 GHSA-37f3-6p89-6qr9

Grav: Authenticated ReDoS via regex_replace in Twig Sandbox

MEDIUM 60CWE-1333Published 2026-08-19 · Updated 2026-08-19

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

Grav is a file-based Web platform. Prior to 2.0.4, Grav allowlists the regex_replace filter and function in system/config/security.yaml, and GravExtension::regexReplace() passes an editor-controlled pattern directly to preg_replace(). When security.twig_content.process_enabled is enabled, an authenticated page editor can publish a catastrophically backtracking pattern that consumes PHP worker CPU and denies service to site visitors. This issue is fixed in version 2.0.4.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00381 32nd percentileScored 2026-11-07

Fix Fixed grav (getgrav): 2.0.4getgrav/grav (Packagist): 2.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
getgrav	grav	before 2.0.4	2.0.4	Patch available	CNA
—	getgrav/grav (Packagist)	before 2.0.4	2.0.4	Patch available	GHSA-37f3-6p89-6qr9

grav Vendorgetgrav Affected before 2.0.4 Fixed in 2.0.4 Patch available CNA
getgrav/grav (Packagist) Vendor— Affected before 2.0.4 Fixed in 2.0.4 Patch available GHSA-37f3-6p89-6qr9

Remediation

Fix · CNA grav (getgrav) Fixed in 2.0.4
Fix · GHSA-37f3-6p89-6qr9 getgrav/grav (Packagist) Fixed in 2.0.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-62672
2026-10-03 Alias added: GHSA-37f3-6p89-6qr9

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-62672

Other 4

TI-2026-30893 Grav: Privilege Escalation via Missing Server-Side Validation of groups/access CVSS 3.1CRITICAL 9.4
TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
TI-2021-04523 Unauthenticated Arbitrary YAML Write/Update leads to Code Execution CVSS 3.1CRITICAL 9.8
TI-2026-50940 Grav CMS before 2.0.16 Origin Validation Bypass via Referer CVSS 4.0CRITICAL 9.3
TI-2026-46446 Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData CVSS 4.0CRITICAL 9.3
TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3

See all 228 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences