CVE-2026-71439

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Mermaid radar diagrams are vulnerable to DoS · Advisory · mermaid-js/mermaid · GitHub

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-rhh3-jpg6-66xh
github_release Patch Available

[email protected]

Patch available: mermaid-js/mermaid [email protected]

https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.16.1
github_pr Patch Available

Release Candidate 11.16.1

Patch available: mermaid-js/mermaid [email protected] (PR #8022 merged 2026-08-04)

https://github.com/mermaid-js/mermaid/pull/8022
github_commit Patch Available

commit 59b22fad2b3b (mermaid-js/mermaid)

Patch available: mermaid-js/mermaid [email protected] (contains commit 59b22fad2b3b)

https://github.com/mermaid-js/mermaid/commit/59b22fad2b3bb04f87a476c84a8a2b24679e607e

Vendor Advisories for CVE-2026-71439(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (16 versions)——
npm(1)
PackageVulnerable rangeFixed inDependents
mermaid—11.16.1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-19 18:49 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 19:08 UTCEG score recompute
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-17 21:03 UTCEG score recompute
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-16 22:59 UTCEG score recompute
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 02:15 UTCEPSS rescore
  13. 2026-08-15 02:53 UTCEG score recompute
  14. 2026-08-15 01:31 UTCEPSS rescore
  15. 2026-08-14 04:49 UTCEG score recompute
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 06:46 UTCEG score recompute
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-12 08:42 UTCEG score recompute
  20. 2026-08-11 10:39 UTCEG score recompute
  21. 2026-08-11 00:00 UTCEPSS rescore
  22. 2026-08-09 14:34 UTCEG score recompute
  23. 2026-08-09 13:47 UTCEPSS rescore
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-07 18:27 UTCEG score recompute
Show 4 more
  1. 2026-08-07 17:27 UTCEG score recompute
  2. 2026-08-06 22:37 UTCEG score recompute▲ 5.30
  3. 2026-08-06 22:37 UTCNVD updateCVSS v3 → 5.3 · CVSS v4 → 5.3
  4. 2026-08-06 20:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-71439?
CVE-2026-71439 is a medium vulnerability published on August 6, 2026. 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…
When was CVE-2026-71439 disclosed?
CVE-2026-71439 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71439 actively exploited?
CVE-2026-71439 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.5% of all scored CVEs.
What is the CVSS score of CVE-2026-71439?
CVE-2026-71439 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-71439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71439, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71439

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