OpenCTI-Platform OpenCTI 6.9.7/7.260227.0/7.260401.0 JSON ingestion mapper json-mapper.ts extractWithRegexp redos

Summaryinfo

A vulnerability was found in OpenCTI-Platform OpenCTI. It has been classified as problematic. Affected by this issue is the function extractWithRegexp of the file opencti-platform/opencti-graphql/src/parser/json-mapper.ts of the component JSON ingestion mapper. This manipulation causes redos. This vulnerability is tracked as CVE-2026-76821. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OpenCTI-Platform OpenCTI. It has been declared as problematic. Affected by this vulnerability is the function extractWithRegexp of the file opencti-platform/opencti-graphql/src/parser/json-mapper.ts of the component JSON ingestion mapper. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-76821 since 08/19/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK.

Upgrading to version 7.260706.0 eliminates this vulnerability.

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Productinfo

Vendor

• OpenCTI-Platform

Name

• OpenCTI

Version

• 6.9.7
• 7.260227.0
• 7.260401.0

Website

• Product: https://github.com/OpenCTI-Platform/opencti/

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