Is CVE-2026-41159 actively exploited?

No active exploitation of CVE-2026-41159 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-41159 be exploited remotely?

Yes. CVE-2026-41159 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-41159?

CVE-2026-41159 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-41159

CWE-94Published: May 29, 2026· Updated: Jun 1, 2026

5.3

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:15.0th

Official Description

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.6 and 11.15.0, Mermaid's default configuration allows injecting CSS that applies outside of the Mermaid diagram via the fontFamily, themeCSS, and altFontFamily configuration options. The injected CSS exploits stylis's & (scope reference) handling. :not(&) escapes the #mermaid-xxx automatic scoping, applying styles to all page elements. Global at-rules (@font-face, @keyframes, @counter-style) are also injectable as stylis hoists them to top level. This allows page defacement and DOM attribute exfiltration via CSS :has() selectors. This vulnerability is fixed in 10.9.6 and 11.15.0.

NVD Source

Technical Analysis

CVE-2026-41159 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.