Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| mermaid-js | mermaid | >= 11.5.0, < 11.16.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-mermaid | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-mermaid | No fix yet | — |
| Ubuntu 22.04 LTS | node-mermaid | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | jupyter-base-notebook | 7.6.3-r2 | — |
| Wolfi rolling | langfuse-3-compat | 3.225.7-r6 | — |
| Wolfi rolling | langfuse-3-worker | 3.225.1-r2 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | mermaid | >= 11.5.0, < 11.16.1 | 11.16.1 | GHSA-3rrr-jr9j-h3q3 |