CVE-2026-71437

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). 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
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr, github_release.
github Patch Available🟡 PoC Available

Mermaid Architecture diagrams are vulnerable to prototype pollution · Advisory · mermaid-js/mermaid · GitHub

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-3rrr-jr9j-h3q3
github_release Patch Available

[email protected]

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

https://github.com/mermaid-js/mermaid/releases/tag/[email protected]
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 99af3fc35ef0 (mermaid-js/mermaid)

Patch available: mermaid-js/mermaid [email protected] (contains commit 99af3fc35ef0)

https://github.com/mermaid-js/mermaid/commit/99af3fc35ef0a9a9c8c6314521344d67523ddccf

Vendor Advisories for CVE-2026-71437(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 rangeFix by version rangeDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (15 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (16 versions)
  • every version on: no fix on record
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
mermaid—
  • 11.5.0 up to 11.16.1: fixed in 11.16.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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. 2026-10-05 08:22 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-04 05:48 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 09:38 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 23:00 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 05:53 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 17:28 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-24 11:37 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 12:15 UTCEG score recompute
  17. 2026-09-22 12:51 UTCEG score recompute
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-21 12:46 UTCEG score recompute
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 00:30 UTCEG score recompute
  22. 2026-09-19 01:09 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 01:41 UTCEG score recompute
  25. 2026-09-17 02:20 UTCEG score recompute
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  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 02:57 UTCEG score recompute
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-13 23:38 UTCEG score recompute
  6. 2026-09-13 00:18 UTCEG score recompute
  7. 2026-09-12 15:02 UTCEPSS rescore
  8. 2026-09-12 00:54 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 01:33 UTCEG score recompute
  11. 2026-09-10 09:35 UTCEPSS rescore
  12. 2026-09-10 02:09 UTCEG score recompute
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 17:52 UTCEG score recompute
  15. 2026-09-06 13:48 UTCEPSS rescore
  16. 2026-09-06 07:51 UTCEG score recompute
  17. 2026-09-05 08:31 UTCEG score recompute
  18. 2026-09-04 09:11 UTCEG score recompute
  19. 2026-09-04 05:07 UTCEPSS rescore
  20. 2026-09-03 06:12 UTCEG score recompute
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 22:04 UTCEG score recompute
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 22:34 UTCEG score recompute
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 15:26 UTCEG score recompute
  28. 2026-08-30 01:22 UTCEPSS rescore
  29. 2026-08-29 16:05 UTCEG score recompute
  30. 2026-08-28 21:42 UTCEPSS rescore
  31. 2026-08-28 11:59 UTCEG score recompute
  32. 2026-08-27 07:54 UTCEG score recompute
  33. 2026-08-26 14:47 UTCEPSS rescore
  34. 2026-08-26 06:40 UTCEG score recompute
  35. 2026-08-25 13:49 UTCEPSS rescore
  36. 2026-08-25 06:52 UTCEG score recompute
  37. 2026-08-23 08:11 UTCEG score recompute
  38. 2026-08-23 00:19 UTCEPSS rescore
  39. 2026-08-22 08:48 UTCEG score recompute
  40. 2026-08-21 23:49 UTCEPSS rescore
  41. 2026-08-21 09:28 UTCEG score recompute
  42. 2026-08-20 22:56 UTCEPSS rescore
  43. 2026-08-20 10:07 UTCEG score recompute
  44. 2026-08-19 17:04 UTCEPSS rescore
  45. 2026-08-19 10:47 UTCEG score recompute
  46. 2026-08-18 13:49 UTCEPSS rescore
  47. 2026-08-18 13:49 UTCEPSS rescore
  48. 2026-08-18 11:27 UTCEG score recompute
  49. 2026-08-17 13:47 UTCEPSS rescore
  50. 2026-08-17 12:07 UTCEG score recompute
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 12:46 UTCEG score recompute
  54. 2026-08-16 02:15 UTCEPSS rescore
  55. 2026-08-15 13:26 UTCEG score recompute
  56. 2026-08-15 01:31 UTCEPSS rescore
  57. 2026-08-14 14:06 UTCEG score recompute
  58. 2026-08-13 22:00 UTCEPSS rescore
  59. 2026-08-12 15:25 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescore
  61. 2026-08-11 15:56 UTCEG score recompute
  62. 2026-08-11 00:00 UTCEPSS rescore
  63. 2026-08-09 17:08 UTCEG score recompute
  64. 2026-08-09 13:47 UTCEPSS rescore
  65. 2026-08-08 17:48 UTCEG score recompute
  66. 2026-08-08 16:37 UTCEPSS rescore
  67. 2026-08-07 18:27 UTCEG score recompute
  68. 2026-08-07 17:47 UTCEG score recompute
  69. 2026-08-06 22:37 UTCEG score recompute▲ 6.50
  70. 2026-08-06 22:37 UTCNVD updateCVSS v3 → 6.5 · CVSS v4 → 6.5
  71. 2026-08-06 20:07 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-71437?
CVE-2026-71437 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 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of proto. Because the group id is used directly as…
When was CVE-2026-71437 disclosed?
CVE-2026-71437 was first published on August 6, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71437 actively exploited?
CVE-2026-71437 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71437?
CVE-2026-71437 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71437?
A fix for CVE-2026-71437 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71437 are linked in the Vendor Advisories panel on this page.

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