CVE-2026-70656
- Source
- https://cve.org/CVERecord?id=CVE-2026-70656
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70656.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-70656
- Aliases
-
- GHSA-4c6j-p2cv-wf56
- Published
- 2026-08-21T17:59:28Z
- Modified
- 2026-10-28T02:30:23Z
- Severity
-
- 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Checkmate: Regular Expression Denial of Service (ReDoS) via User-Controlled Regex in Monitor Advanced Matching
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-1333" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70656.json" }- References
-
- https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70656.json
- https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-4c6j-p2cv-wf56
- https://nvd.nist.gov/vuln/detail/CVE-2026-70656
- https://github.com/bluewave-labs/Checkmate/commit/0df71d6356c87c747e0b796b0c34e33f2a5203fa
- https://github.com/bluewave-labs/Checkmate/commit/adba25269c455878bf8065bc28cfe5d74e58692f
- https://github.com/bluewave-labs/Checkmate/commit/d5ec2936ad77ab773529057b442a6eb55dd578eb
Affected packages
Git / github.com/bluewave-labs/checkmate
Affected ranges
- Type
- GIT
- Repo
- https://github.com/bluewave-labs/checkmate
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "3.5.1" }, { "fixed": "3.9.2" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "0df71d6356c87c747e0b796b0c34e33f2a5203fa" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "adba25269c455878bf8065bc28cfe5d74e58692f" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "d5ec2936ad77ab773529057b442a6eb55dd578eb" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v3.9.2", "range": [ { "fixed": "d368ec5bd7af1cd81628c47a89d1d830cd415590" } ], "source": "REFERENCES_TAG" } ] }