EUVD-2026-62542
GHSA-37f3-6p89-6qr9
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered but requires authenticated editor and non-default Twig config (AC:H, PR:L); availability-only impact with no scope change.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Regex-driven denial of service in Grav CMS prior to 2.0.4 allows authenticated page editors to exhaust PHP worker CPU by injecting catastrophically backtracking regular expression patterns through the allowlisted regex_replace Twig filter. The vulnerable path exists in GravExtension::regexReplace(), which forwards editor-supplied patterns directly to preg_replace() without backtrack-limit enforcement or error recovery. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concrete prerequisites: (1) the attacker must hold an authenticated page-editor account on the target Grav instance - PR:L in the CVSS vector confirms low-privilege authentication is required; (2) the `security.twig_content.process_enabled` setting must be enabled in `system/config/security.yaml`, which is a non-default configuration (AT:P in CVSS 4.0 reflects this specific deployment requirement). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.0 with vector AV:N/AC:H/AT:P/PR:L reflects a genuinely constrained attack surface: exploitation requires both authenticated low-privilege editor access and the non-default `security.twig_content.process_enabled` configuration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Grav 2.0.4 or later, which is available at https://github.com/getgrav/grav/releases/tag/2.0.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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