CVE-2026-71437
Description
A flaw was found in Mermaid, a JavaScript tool for creating diagrams. This vulnerability, known as prototype pollution, occurs when a specially crafted diagram defines a group with a specific identifier. An attacker who can provide malicious diagram text can exploit this by manipulating core JavaScript object properties, potentially leading to arbitrary code execution or denial of service in the embedding application. This could allow an attacker to gain control over the application or disrupt its operations.
Statement
This Moderate severity flaw in Mermaid Architecture Diagrams allows prototype pollution when processing specially crafted diagram text. An attacker could exploit this to corrupt application configuration, bypass security checks, or cause denial of service in Red Hat products that embed Mermaid, such as Red Hat OpenShift AI, Red Hat Build of Podman Desktop, and Red Hat OpenShift Dev Spaces. Direct remote code execution is not possible through this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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 | 5.4 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
An attacker could modify sensitive data or program variables.
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
Frequently Asked Questions
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