CVE-2026-62672

MEDIUM 6 PoC AVAILABLE

Published 2026-08-19 · Last modified 2026-08-19

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 23rd percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

6CVSS 4.0 · MEDIUM

ConfidentialityNone
IntegrityNone
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
⚠Privileges: Requires a low-privilege account
✓User interaction: No user interaction needed
⚠Complexity: Needs a race window or specific setup
⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

reference https://github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9
github-search Search GitHub for public PoC repos

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-62672/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-62672/poc.json

Affected

Vendors Getgrav

Products Grav

Weakness (CWE)

CWE-1333: : Inefficient Regular Expression Complexity

CVSS vector

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

All CVSS metrics

MEDIUM 6 v4.0 · CNA Primary
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
MEDIUM 6 v4.0 · NVD Secondary
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

References

Exploits & PoC

https://github.com/getgrav/grav/security/advisories/GHSA-37f3-6p89-6qr9 x_refsource_CONFIRMexploit

Technical & other

https://github.com/getgrav/grav/commit/907116268ad4f48be7472c57f64981918578599a x_refsource_MISC
https://github.com/getgrav/grav/releases/tag/2.0.4 x_refsource_MISC

Sources: NVD · CVE.org · EPSS