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CVE-2026-41150

Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS

MEDIUM
5.3
CVSS Score
Published: May 29, 2026 at 01:54 PM UTC
Updated: July 21, 2026 at 01:39 PM UTC
2 products affected across 2 vendorsMermaidMermaid

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
PoC

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, there is a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates. mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram). This vulnerability is fixed in 10.9.6 and 11.15.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mermaid· Mermaid Projectnpm
95%
v < 10.9.611.0.0 ≤ v < 11.15.0
Affected range stops below 10.9.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.15.0, so it looks safe — our inference, not a vendor statement
Mermaid· Mermaid Js
60%
v < 10.9.6v < 11.15.0
Affected range stops below 10.9.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.15.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMThird Party Advisory
Source: cverecord
https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh
x_refsource_MISCPatch
Source: cverecord
https://github.com/mermaid-js/mermaid/commit/a59ea56174712ee5430dfd5bc877cb5151f501a6
x_refsource_MISCPatch
Source: cverecord
https://github.com/mermaid-js/mermaid/commit/faafb5d49106dd32c367f3882505f2dd625aa30e
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusANALYZED
CWE
CWE-835

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