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CVE-2026-70656— Checkmate: Regular Expression Denial of Service (ReDoS) via User-Controlled Regex in Monitor Advanced Matching

Quick assessment

Affected
bluewave-labs Checkmate
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.

Checkmate 是一款开源、自托管的工具，用于实时跟踪和监控服务器硬件、正常运行时间、响应时间及事件，并提供美观的可视化界面。在版本 3.5.1 至 3.9.2 中，已认证的管理员或超级管理员可以将 matchMethod 设置为 regex，并在 expectedValue 字段中插入恶意的正则表达式，用于高级 HTTP 监控匹配。server/src/api/validation/monitorValidation.ts 会接受该表达式，而 server/src/service/network/Advanc

CVSS 4.9 · Medium EPSS 0.42% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
bluewave-labs Checkmate >= 3.5.1, < 3.9.2 affected
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I. Basic Information for CVE-2026-70656

Vulnerability Information
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Vulnerability Title
Checkmate: Regular Expression Denial of Service (ReDoS) via User-Controlled Regex in Monitor Advanced Matching
Source: CVE Program / CVE List V5
Vulnerability Description
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. From 3.5.1 until 3.9.2, an authenticated admin or superadmin can set matchMethod to regex and place a malicious expression in the expectedValue field for advanced HTTP monitor matching. server/src/api/validation/monitorValidation.ts accepts the expression, and server/src/service/network/AdvancedMatcher.ts synchronously evaluates it against an attacker-controlled HTTP response body on the Node.js main event loop without a timeout or worker isolation, allowing catastrophic backtracking to freeze API endpoints, monitor checks, and WebSocket connections for all users. This issue is fixed in version 3.9.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
bluewave-labs Checkmate >= 3.5.1, < 3.9.2 -

II. Public POCs for CVE-2026-70656

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III. Intelligence Information for CVE-2026-70656

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Patches & Fixes for CVE-2026-70656 (3)

Vendor Advisories for CVE-2026-70656 (1)

Other References for CVE-2026-70656 (1)

Same Patch Batch · bluewave-labs · 2026-08-21 · 3 CVEs total

CVE-2026-71862 7.5 HIGH Checkmate: Sensitive Bearer Token Exposure via Public Status Pages When showURL Setting is
CVE-2026-55241 7.5 HIGH Checkmate: Pre-auth Denial of Service via File Upload on Registration

IV. Related Vulnerabilities

Same product: Checkmate
Same vendor: bluewave-labs
Same weakness: CWE-1333

V. Comments for CVE-2026-70656

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