Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-62237— Grav < 2.0.4 ReDoS via regex_replace in Sandbox

Quick assessment

Affected
getgrav grav
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 2.0.4之前版本存在资源管理错误漏洞，该漏洞源于regex_replace过滤器和函数存在正则表达式拒绝服务漏洞，可能导致经过身份验证的页面编辑者在启用Twig处理时，构造导致灾难性回溯的PCRE模式传递给PHP的preg_replace()函数，造成无限CPU消耗和拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.44% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.4 affected
2.0.4 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-62237

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Grav < 2.0.4 ReDoS via regex_replace in Sandbox
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
getgrav Grav 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 2.0.4之前版本存在资源管理错误漏洞，该漏洞源于regex_replace过滤器和函数存在正则表达式拒绝服务漏洞，可能导致经过身份验证的页面编辑者在启用Twig处理时，构造导致灾难性回溯的PCRE模式传递给PHP的preg_replace()函数，造成无限CPU消耗和拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav 0 ~ 2.0.4 -

II. Public POCs for CVE-2026-62237

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-62237

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-62237 (2)

Same Patch Batch · getgrav · 2026-07-17 · 10 CVEs total

CVE-2026-62233 8.8 HIGH grav-plugin-api < 1.0.6 Privilege Escalation via createApiKey
CVE-2026-62234 8.1 HIGH Grav < 2.0.4 SSRF via Unrestricted cURL Protocols
CVE-2026-62231 8.1 HIGH Grav < 1.0.6 API Key Scope Bypass via ApiKeyAuthenticator
CVE-2026-62386 7.5 HIGH Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter
CVE-2026-62230 7.5 HIGH Grav < 2.0.4 File Access Bypass via Case Variation
CVE-2026-62232 7.4 HIGH Grav < 2.0.4 2FA Bypass via Secret Regeneration
CVE-2026-62387 7.1 HIGH Grav < 1.0.0-rc.16 CORS Misconfiguration via API Plugin
CVE-2026-62235 6.3 MEDIUM Grav Flex-Objects < 1.4.3 Authorization Bypass via API
CVE-2026-62236 5.4 MEDIUM grav-plugin-login < 3.8.11 CSRF via regenerate2FASecret

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-1333

V. Comments for CVE-2026-62237

No comments yet

Leave a comment