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CVE-2026-71439

Mermaid radar diagrams are vulnerable to DoS

5.3 MediumFix available

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

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

0.53%Up 0.1 points since Aug 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

Mermaid radar diagrams are vulnerable to DoS

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
CVE-2026-71439
CVSS 4.0
5.3 MediumCVSS: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-606, CWE-1322
Updated
2026-11-02
EUVDEUVD-2026-54249 5.3

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
EUVD-2026-54249
CVSS 4.0
5.3 MediumCVSS: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-rhh3-jpg6-66xh 5.3

Mermaid radar diagrams are vulnerable to DoS

Impact

Mermaid radar diagrams allow arbitrary large values for ticks, which can cause high CPU usage, freezing the webpage/JavaScript process for long periods of time, until the process is eventually killed due to OOM/running out of memory.

Proof-of-concept

radar-beta
  axis a, b
  curve c {1, 1}
  ticks 1000000000

Patches

Has the problem been patched? What versions should users upgrade to?

This problem has been patched by https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e, which was released in Mermaid v11.16.1

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

There are no known workarounds without updating to a patched version of mermaid.

References

Are there any links users can visit to find out more?

Record
GHSA-rhh3-jpg6-66xh
CVSS 4.0
5.3 MediumCVSS: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-606, CWE-1322
Updated
2026-11-02
NVD 5.3

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
CVE-2026-71439
CVSS 4.0
5.3 MediumCVSS: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
Weakness
CWE-606, CWE-1322
Updated
2026-11-02
OSV 5.3

Mermaid radar diagrams are vulnerable to DoS

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
CVE-2026-71439
CVSS 4.0
5.3 MediumCVSS: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-1322, CWE-606
Updated
2026-11-02
OSVDEBIAN-CVE-2026-71439 5.3

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
DEBIAN-CVE-2026-71439
CVSS 4.0
5.3 MediumCVSS: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
Updated
2026-11-02
OSVGHSA-rhh3-jpg6-66xh 5.3

Mermaid radar diagrams are vulnerable to DoS

Impact

Mermaid radar diagrams allow arbitrary large values for ticks, which can cause high CPU usage, freezing the webpage/JavaScript process for long periods of time, until the process is eventually killed due to OOM/running out of memory.

Proof-of-concept

radar-beta
  axis a, b
  curve c {1, 1}
  ticks 1000000000

Patches

Has the problem been patched? What versions should users upgrade to?

This problem has been patched by https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e, which was released in Mermaid v11.16.1

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

There are no known workarounds without updating to a patched version of mermaid.

References

Are there any links users can visit to find out more?

Record
GHSA-rhh3-jpg6-66xh
CVSS 4.0
5.3 MediumCVSS: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-1322, CWE-606
Updated
2026-11-02
OSVUBUNTU-CVE-2026-71439 5.3

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.6.0 until 11.16.1, Mermaid Radar Diagrams allow arbitrary large values for the ticks parameter, which can cause high CPU usage and freeze the rendering webpage or JavaScript process for long periods of time, potentially until the process is killed from memory exhaustion. This issue is fixed in version 11.16.1.

Record
UBUNTU-CVE-2026-71439
CVSS 4.0
5.3 MediumCVSS: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

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mermaid
npm
 11.6.0 up to 11.16.1
11.16.1
node-mermaid
Debian: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 less
8.13.8+~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
node-mermaid
Ubuntu: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-mermaid
Ubuntu:26.10
 All versions, plus listed versions
9.2.2+~2.0.0-19.2.2+~2.0.0-2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-71439 is a medium vulnerability (CVSS 5.3) in Mermaid-js Mermaid, published August 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.53%, the 44th percentile. Fixed in mermaid 11.16.1.

References

Show 5 moreShow less
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