CVE-2026-71438

LOWPre-NVD 2.42.4—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 2.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 94% 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
2.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 2.4Exploit: 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. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's internal config using the assignWithDepth deep-merge helper, which is vulnerable to prototype pollution. This is only exploitable if an application forwards untrusted data directly into one of these configuration entry points, which is outside their documented usage; diagram-supplied configuration (e.g. %%{init: {}}%% or YAML frontmatter) is not affected. This issue is fixed in versions 10.9.8 and 11.16.1.

CVSS v3
2.4
EG Score
2.4(medium)
EG Risk
11(Track)
EG Risk 11/100SSVC: 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
Severity24% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

References (6)

Vendor Advisories for CVE-2026-71438(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—10.9.8—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 20× 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 21:42 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 20:27 UTCEG score recompute
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 02:15 UTCEPSS rescore
  9. 2026-08-15 01:31 UTCEPSS rescore
  10. 2026-08-13 19:11 UTCEG score recompute
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-11 00:00 UTCEPSS rescore
  13. 2026-08-10 17:56 UTCEG score recompute
  14. 2026-08-09 13:47 UTCEPSS rescore
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-07 16:23 UTCEG score recompute
  17. 2026-08-07 16:03 UTCEG score recompute
  18. 2026-08-06 22:37 UTCEG score recompute▲ 2.40
  19. 2026-08-06 22:37 UTCNVD updateCVSS v3 → 2.4 · CVSS v4 → 2.4
  20. 2026-08-06 20:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-71438?
CVE-2026-71438 is a low vulnerability published on August 6, 2026. Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's…
When was CVE-2026-71438 disclosed?
CVE-2026-71438 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-2026-71438 actively exploited?
CVE-2026-71438 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 93.6% of all scored CVEs.
What is the CVSS score of CVE-2026-71438?
CVE-2026-71438 has a CVSS v3 base score of 2.4 (NVD).
How do I remediate CVE-2026-71438?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71438, 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-2026-71438

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