CVE-2026-43991

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% 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, nvd
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.4Exploit: NoneExposed: 0

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

JunoClaw is an agentic AI platform built on Juno Network. Prior to 0.x.y-security-1, substring-based blocklist in plugin-shell's command-safety check could be bypassed by adversarial argument constructions, allowing unauthorized command execution on the host when combined with the companion advisory. Pre-patch, the check was applied to the raw command string rather than the parsed first token. This vulnerability is fixed in 0.x.y-security-1.

CVSS v3
8.4
EG Score
8.4(medium)
EPSS
6.7%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 13, 2026

Advisory Details (2)

Auto-updated May 12, 2026
Patch available. Sources: github.
github Patch Available

plugin-shell shell-injection bypass via substring blocklist · Advisory · Dragonmonk111/junoclaw · GitHub

https://github.com/Dragonmonk111/junoclaw/security/advisories/GHSA-fvq5-79h6-952c
generic

security(plugin-shell): C-1/C-2 unsafe-shell Cargo gate + allowlist-only · Dragonmonk111/junoclaw@2bc54f6 · GitHub

https://github.com/Dragonmonk111/junoclaw/commit/2bc54f6

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-16 02:19 UTCOSV refresh
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-13 22:30 UTCEPSS rescore
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  18. 2026-06-28 02:19 UTCEG score recompute
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  21. 2026-06-26 20:52 UTCEG score recompute
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  23. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-23 21:33 UTCEPSS rescore
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  11. 2026-06-17 00:08 UTCEG score recompute
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  13. 2026-06-16 06:33 UTCEG score recompute
  14. 2026-06-15 17:49 UTCEPSS rescore
  15. 2026-06-15 01:16 UTCEG score recompute
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  18. 2026-06-13 23:00 UTCEPSS rescore
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  21. 2026-06-12 23:06 UTCEG score recompute
  22. 2026-06-12 10:58 UTCEG score recompute
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  24. 2026-06-11 14:00 UTCEPSS rescore
  25. 2026-06-11 10:45 UTCEG score recompute
  26. 2026-06-10 22:38 UTCEG score recompute
  27. 2026-06-10 22:18 UTCEPSS rescore
  28. 2026-06-10 13:22 UTCEPSS rescore
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  30. 2026-06-10 10:31 UTCEG score recompute
  31. 2026-06-09 22:24 UTCEG score recompute
  32. 2026-06-09 08:35 UTCEG score recompute
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  34. 2026-06-08 14:17 UTCEPSS rescore
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  36. 2026-06-08 08:21 UTCEG score recompute
  37. 2026-06-07 20:15 UTCEG score recompute
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  40. 2026-06-07 08:08 UTCEG score recompute
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  42. 2026-06-06 13:47 UTCEPSS rescore
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  44. 2026-06-06 07:45 UTCEG score recompute
  45. 2026-06-05 22:47 UTCEPSS rescore
  46. 2026-06-05 19:38 UTCEG score recompute
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  48. 2026-06-05 06:10 UTCEPSS rescore
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  50. 2026-06-04 19:25 UTCEG score recompute
  51. 2026-06-04 13:12 UTCEPSS rescore
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  54. 2026-06-03 19:10 UTCEG score recompute
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  56. 2026-06-02 20:13 UTCEPSS rescore
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  58. 2026-06-02 06:49 UTCEG score recompute
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  60. 2026-06-01 13:52 UTCEPSS rescore
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  62. 2026-06-01 06:35 UTCEG score recompute
  63. 2026-05-31 22:30 UTCEPSS rescore
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  67. 2026-05-29 13:44 UTCEPSS rescore
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  71. 2026-05-27 13:40 UTCEPSS rescore
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  73. 2026-05-26 13:44 UTCEPSS rescore
  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-23 00:07 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-43991?
CVE-2026-43991 is a high vulnerability published on May 12, 2026. JunoClaw is an agentic AI platform built on Juno Network. Prior to 0.x.y-security-1, substring-based blocklist in plugin-shell's command-safety check could be bypassed by adversarial argument constructions, allowing unauthorized command execution on the host when combined with the companion…
When was CVE-2026-43991 disclosed?
CVE-2026-43991 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43991 actively exploited?
CVE-2026-43991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43991?
CVE-2026-43991 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-43991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43991, 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.

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