EUVD-2026-79240Severity 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
Lifecycle Timeline
5DescriptionCVE.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
AnalysisAI
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. …
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External POC / Exploit Code
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