CVE-2026-18996

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-08-06. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

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

A vulnerability has been found in cosmicstack-labs mercury-agent up to 1.1.12. This vulnerability affects the function PermissionManager.checkShellCommand of the file src/capabilities/permissions.ts of the component run_command Handler. Such manipulation leads to incorrect privilege assignment. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

[Security] Mercury Agent `run_command` safe-read approval bypass allows unauthorized file writes via shell redirection · Issue #72 · cosmicstack-labs/mercury-agent · GitHub

https://github.com/cosmicstack-labs/mercury-agent/issues/72
generic

GitHub - cosmicstack-labs/mercury-agent: Soul-driven AI agent with permission-hardened tools, token budgets, and multi-channel access. Runs 24/7 from CLI or Telegram. · GitHub

https://github.com/cosmicstack-labs/mercury-agent/

Vendor Advisories for CVE-2026-18996(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 51× 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. 2026-08-21 04:16 UTCEG score recompute
  2. 2026-08-21 04:16 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 03:23 UTCEG score recompute
  5. 2026-08-20 03:23 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 02:26 UTCEG score recompute
  8. 2026-08-19 02:25 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 01:30 UTCEG score recompute
  11. 2026-08-18 01:30 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 00:38 UTCEG score recompute
  14. 2026-08-17 00:38 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 23:45 UTCEG score recompute
  18. 2026-08-15 23:45 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 22:52 UTCEG score recompute
  21. 2026-08-14 22:52 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 21:59 UTCGHSA enrichment
  24. 2026-08-12 21:07 UTCGHSA enrichment
  25. 2026-08-12 18:54 UTCEG score recompute
Show 26 more
  1. 2026-08-12 18:54 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 18:01 UTCEG score recompute
  4. 2026-08-11 18:01 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 17:08 UTCGHSA enrichment
  8. 2026-08-09 16:15 UTCEG score recompute
  9. 2026-08-09 16:15 UTCGHSA enrichment
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-08 15:23 UTCEG score recompute
  13. 2026-08-08 15:23 UTCGHSA enrichment
  14. 2026-08-07 14:29 UTCEG score recompute
  15. 2026-08-07 14:29 UTCGHSA enrichment
  16. 2026-08-06 13:46 UTCEPSS rescore
  17. 2026-08-06 13:37 UTCEG score recompute
  18. 2026-08-06 13:37 UTCGHSA enrichment
  19. 2026-08-06 13:35 UTCNVD updateCVSS v4 → 2.1
  20. 2026-08-06 12:33 UTCEG score recompute
  21. 2026-08-06 12:33 UTCGHSA enrichment
  22. 2026-08-06 12:33 UTCMITRE cvelistV5CVSS v4 → 5.3
  23. 2026-08-06 05:25 UTCEG score recompute
  24. 2026-08-06 05:25 UTCNVD updateCVSS v4 → 2.1
  25. 2026-08-06 04:25 UTCEG score recompute
  26. 2026-08-06 04:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18996?
CVE-2026-18996 is a medium vulnerability published on August 6, 2026. A vulnerability has been found in cosmicstack-labs mercury-agent up to 1.1.12. This vulnerability affects the function PermissionManager.checkShellCommand of the file src/capabilities/permissions.ts of the component run_command Handler. Such manipulation leads to incorrect privilege assignment. The…
When was CVE-2026-18996 disclosed?
CVE-2026-18996 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18996 actively exploited?
CVE-2026-18996 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 84.0% of all scored CVEs.
What is the CVSS score of CVE-2026-18996?
CVE-2026-18996 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-18996?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18996, 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

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