CVE-2026-62237Public exploitNetwork attack vector

Authenticated service interruption via regex_replace

Published Jul 17, 2026 · Updated Jul 17, 2026

Regular expression denial of service in Grav before 2.0.4 allows remote authenticated users to interrupt service through crafted page content. The sandbox allowlists regex_replace, whose implementation passes an editor-controlled pattern directly to PHP preg_replace without complexity validation. Exploitation requires page-edit access and the nondefault security.twig_content.process_enabled setting; a crafted page can saturate PHP workers and make the site unresponsive.

CVSS severity6.0
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Grav before 2.0.4 allows remote authenticated users to interrupt service through crafted page content. The sandbox allowlists regex_replace, whose implementation passes an editor-controlled pattern directly to PHP preg_replace without complexity validation. Exploitation requires page-edit access and the nondefault security.twig_content.process_enabled setting; a crafted page can saturate PHP workers and make the site unresponsive.

The record

CVE
CVE-2026-62237
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=0 <2.0.4

Published CVSS scores

6.0VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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