EUVD-2026-79240Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Sep 15, 2026
Authenticated OpenCTI users holding JSON mapper creation permission can craft a catastrophically backtracking regular expression in the extractWithRegexp mapper formula, blocking the Node.js event loop and making the GraphQL API unavailable to every user on the instance. The flaw affects only availability — no data is exposed or modified — and requires the attacker to already hold a privileged mapper-management role, but scheduled ingestion can re-trigger the lockup repeatedly without further attacker action, and recovery may require disabling the mapper and restarting the process. Fixed in OpenCTI 7.260706.0, where the vulnerable JavaScript RegExp engine was replaced with RE2, a linear-time regex library; no public exploit code or CISA KEV listing was identified at time of analysis.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
Lifecycle Timeline
2DescriptionCVE.org
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260706.0, the JSON ingestion mapper's extractWithRegexp formula function compiled a user-supplied regular expression with the JavaScript RegExp engine in opencti-platform/opencti-graphql/src/parser/json-mapper.ts without validating its complexity. An authenticated user with JSON mapper creation permission could provide a catastrophically backtracking pattern and matching ingestion input, blocking the Node.js event loop and making the GraphQL API unavailable to all users. Scheduled ingestion could repeatedly execute the malicious mapper without additional attacker action, and recovery could require disabling the mapper and restarting the process. The issue affects availability and does not expose or modify data. This issue is fixed in version 7.260706.0.
Articles & Coverage 1
Technical POC Analysis
CWE-400 (Uncontrolled Resource Consumption); the advisory also assigns CWE-1333 (Inefficient Regular Expression Complexity).
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Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
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Exploit-DB