VDB
CVE-2026-71437
CVE-2026-71437
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published August 6, 2026
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.
Risk Scores
CVSS 4.0
6.5
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:H/SI:H/SA:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| mermaid-js | mermaid | >= 11.5.0, < 11.16.1 |
| chainguard | gitlab-rails-ce-19.2 | 0 |
| chainguard | jupyter-base-notebook | 0 |
| chainguard | langfuse-3 | 0, 0 |
| chainguard | commercial-gitlab-rails-ee-fips-19.1 | 0 |
| chainguard | langfuse-4 | 0 |
| chainguard | langfuse-fips-2 | 0 |
| wolfi | langfuse-3 | 0, 0 |
| chainguard | commercial-gitlab-rails-ee-19.1 | 0 |
| chainguard | langfuse-2 | 0 |
| chainguard | langfuse-fips-3 | 0 |
| npm | mermaid | 11.5.0 |
| chainguard | gitlab-rails-ce-fips-19.3 | 0 |
| chainguard | gitlab-rails-ce-fips-19.2 | 0 |
| chainguard | tensorflow-gpu-jupyter | 0 |
| chainguard | gitlab-rails-ce-fips-19.0 | 0 |
| chainguard | langfuse-fips-4 | 0 |
| chainguard | gitlab-rails-ce-fips-19.1 | 0 |
| mermaid-js | mermaid | 11.5.0 |
| chainguard | gitlab-rails-ce-fips-18.11 | 0 |
…and 2 more
Timeline
- Aug 6, 2026 CVE Published
- Aug 7, 2026 EPSS Score
- Aug 7, 2026 Coalition ESS Score
- Aug 9, 2026 Security Advisory
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 4, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
References
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-3rrr-jr9j-h3q3 x_refsource_CONFIRM
- https://github.com/mermaid-js/mermaid/pull/8022 x_refsource_MISC
- https://github.com/mermaid-js/mermaid/commit/99af3fc35ef0a9a9c8c6314521344d67523ddccf x_refsource_MISC
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid@11.16.1 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-71437 advisory
- https://github.com/advisories/GHSA-3rrr-jr9j-h3q3 advisory