CVE-2026-71439Public exploitNetwork attack vector

Rendering-process hang via unbounded radar ticks

Published Aug 6, 2026 · Updated Aug 6, 2026

Denial of service in Mermaid 11.6.0 through 11.16.0 allows remote attackers to freeze a rendering process via a crafted radar diagram. The radar diagram setOptions function stored the unbounded ticks value without enforcing a maximum, allowing rendering work to scale with attacker-controlled input. Exploitation requires an application or user to render attacker-controlled radar diagram text; the result ranges from a prolonged hang to process termination under memory exhaustion.

CVSS severity5.3
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Mermaid 11.6.0 through 11.16.0 allows remote attackers to freeze a rendering process via a crafted radar diagram. The radar diagram setOptions function stored the unbounded ticks value without enforcing a maximum, allowing rendering work to scale with attacker-controlled input. Exploitation requires an application or user to render attacker-controlled radar diagram text; the result ranges from a prolonged hang to process termination under memory exhaustion.

The record

CVE
CVE-2026-71439
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Mermaid
Product
Mermaid
Classifications
CWE-1322, CWE-606, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 11.6.0, < 11.16.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mermaid · Mermaidversion=>= 11.6.0, < 11.16.1

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1322Use of Blocking Code in Single-threaded, Non-blocking Context
CWE-606Unchecked Input for Loop Condition
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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