CVE-2026-71439
Description
A flaw was found in Mermaid. Mermaid Radar Diagrams are susceptible to a denial of service vulnerability. A remote attacker could exploit this by providing excessively large values for the 'ticks' parameter. This can lead to high CPU usage, causing the rendering webpage or JavaScript process to freeze and potentially terminate due to memory exhaustion.
Statement
Red Hat ships Mermaid embedded in the same code-server based developer workbench images: OpenShift AI's odh-workbench-codeserver-datascience-cpu-py312 workbench image and OpenShift Dev Spaces' code-rhel9 image. The bundled version (>=11.6.0,<11.16.1) exposes users who render Mermaid Radar diagrams with excessively large 'ticks' values to a client-side denial of service through high CPU usage and potential process termination.
Mitigation
Avoid rendering untrusted Mermaid diagram content containing Radar diagrams with attacker-controlled 'ticks' parameters in the affected workbench images until the pinned mermaid dependency is upgraded to 11.16.1 or later.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other); Reduce Performance
This issue can make the product perform more slowly. If an attacker can influence the number of iterations in the loop, then this performance problem might allow a denial of service by consuming more platform resources than intended.
Frequently Asked Questions
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