CVE-2026-41150: Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts

Q: How do I fix CVE-2026-41150?

mermaid: upgrade to 10.9.6, 11.15.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41150 being exploited?

CVE-2026-41150 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41150 affect?

CVE-2026-41150 affects mermaid. Severity is medium (CVSS 5.3). 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 excl

Q: How urgent is CVE-2026-41150?

Priority 32/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-41150 is a medium-severity flaw (CVSS 5.3) affecting mermaid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-835
Published	2026-05-29
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: mermaid project

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-29 15:16 UTCPublished CVE record published
2026-07-21 12:10 UTCUpdated Record last modified

mermaid project mermaid UPGRADE

Affected: < 10.9.6 · >= 11.0.0 and < 11.15.0

Fixed in: 10.9.6, 11.15.0

Safe to downgrade to: a release before 11.0.0

1. Check installed version

npm ls mermaid

2. UPGRADE to 10.9.6

npm install mermaid@">=10.9.6"

3. If no update is available yet, DOWNGRADE to a release before 11.0.0

npm view mermaid versions npm install mermaid@"<11.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41150?

mermaid: upgrade to 10.9.6, 11.15.0. Exact commands for each OS are on this page.

Is CVE-2026-41150 being exploited?

CVE-2026-41150 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41150 affect?

CVE-2026-41150 affects mermaid. Severity is medium (CVSS 5.3). 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 excl

How urgent is CVE-2026-41150?

Priority 32/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41159 MEDIUM 5.3 UPGRADE Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts

References

← Back to latest CVEs