CVE-2026-41150
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
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.
- Record
CVE-2026-41150- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-835
- Updated
- 2026-11-02
EUVDEUVD-2026-33325
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.
- Record
EUVD-2026-33325- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6m6c-36f7-fhxh
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Impact
Mermaid v11.14.0 and earlier are vulnerable to a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates.
Example:
gantt
excludes monday,tuesday,wednesday,thursday,friday,saturday,sunday
DoS :2025-01-01, 1d
mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram).
Patches
This has been patched in:
- v11.15.0 (see faafb5d49106dd32c367f3882505f2dd625aa30e)
- v10.9.6 (see a59ea56174712ee5430dfd5bc877cb5151f501a6)
Workarounds
There are no workarounds available without updating to a newer version of mermaid.
- Record
GHSA-6m6c-36f7-fhxh- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-835
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-41150- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-835
- Updated
- 2026-11-02
OSV
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
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.
- Record
CVE-2026-41150- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-835
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-41150
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.
- Record
DEBIAN-CVE-2026-41150- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVGHSA-6m6c-36f7-fhxh
Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
Impact
Mermaid v11.14.0 and earlier are vulnerable to a denial-of-service attack when rendering gantt charts, if they use the excludes attribute to exclude all dates.
Example:
gantt
excludes monday,tuesday,wednesday,thursday,friday,saturday,sunday
DoS :2025-01-01, 1d
mermaid.parse is unaffected, unless you then call the ganttDb.getTasks() (which is called when rendering a diagram).
Patches
This has been patched in:
- v11.15.0 (see faafb5d49106dd32c367f3882505f2dd625aa30e)
- v10.9.6 (see a59ea56174712ee5430dfd5bc877cb5151f501a6)
Workarounds
There are no workarounds available without updating to a newer version of mermaid.
- Record
GHSA-6m6c-36f7-fhxh- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-835
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-41150
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.
- Record
UBUNTU-CVE-2026-41150- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mermaidnpm |
11.0.0-alpha.1 to 11.14.0 | 11.15.0 |
mermaidnpm |
through 10.9.5 | 10.9.6 |
node-mermaidDebian:14 |
All versions, plus listed versions 8.11.0+ds+~cs29.13.22-18.13.2+ds+~cs30.13.21-18.13.2+ds+~cs30.13.21-1.18.13.3+ds+~cs26.13.21-18.13.3+ds+~cs26.13.21-2 Show 11 moreShow less8.13.8+~cs10.4.16-18.14.0+ds1+~cs11.4.14-18.14.0+~cs11.4.14-18.7.0+ds+~cs27.17.17-18.7.0+ds+~cs27.17.17-28.7.0+ds+~cs27.17.17-2~bpo10+18.7.0+ds+~cs27.17.17-38.9.1+ds+~cs26.20.25-18.9.3+ds+~cs29.13.19-19.2.2+~2.0.0-19.2.2+~2.0.0-2 |
None known |
mermaidnpm |
11.0.0-alpha.1 up to 11.15.0 | 11.15.0 |
mermaidnpm |
before 10.9.6 | 10.9.6 |
node-mermaidUbuntu:22.04:LTS |
All versions, plus listed versions 8.7.0+ds+~cs27.17.17-38.13.3+ds+~cs26.13.21-18.13.3+ds+~cs26.13.21-28.13.8+~cs10.4.16-1 |
None known |
node-mermaidUbuntu:26.10 |
All versions, plus listed versions 9.2.2+~2.0.0-19.2.2+~2.0.0-2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-41150 is a medium vulnerability (CVSS 5.3) in Mermaid-js Mermaid, published May 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 32nd percentile. Fixed in mermaid 11.15.0.
References
github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh
nvd.nist.gov/vuln/detail/CVE-2026-41150