CVE & CISA-KEV Catalog

CVE-2026-41159

MEDIUM
5.3
CVSS v3
NVD

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.

CWE-94Code Injection

How to fix

Remediation Available
mermaidNVD
Affected:< 10.9.6Fixed in:10.9.6CVE-2026-41159derived from NVD
Affected:>= 11.0.0, < 11.15.0Fixed in:11.15.0CVE-2026-41159derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.40%probability of exploitation in 30 days
32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Third-Party Advisory1
Release Notes2
Other references2

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2017-9841Critical9.8100%KEVFix
CVE-2015-1635Critical9.8100%KEV-
CVE-2022-22954Critical9.8100%KEV + Ransom-
CVE-2021-22204Medium6.8100%KEVFix
CVE-2025-3248Critical9.8100%KEVFix
CVE-2012-0158High8.8100%KEV-
Embed a live status badge for CVE-2026-41159
CVE-2026-41159 severity badge

Markdown

[![CVE-2026-41159](https://tridentstack.com/cve/badge/CVE-2026-41159.svg)](https://tridentstack.com/cve/CVE-2026-41159)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-41159"><img src="https://tridentstack.com/cve/badge/CVE-2026-41159.svg" alt="CVE-2026-41159"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-01.