CVE-2026-18998

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM 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: 0.4%CVSS: 6.3Exploit: Elevated riskExposed services: Not assessed

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

A vulnerability was determined in cosmicstack-labs mercury-agent up to 1.1.12. Impacted is the function SubAgent.run of the file src/core/sub-agent.ts of the component delegate_task Tool. Executing a manipulation can lead to improper authorization. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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

August 12, 2026

Advisory Details (2)

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

[Security] Restricted Mercury sub-agents can enumerate and halt sibling agents despite `allowedTools` constraints · Issue #74 · cosmicstack-labs/mercury-agent · GitHub

https://github.com/cosmicstack-labs/mercury-agent/issues/74

Vendor Advisories for CVE-2026-18998(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 61× 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 144 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 05:56 UTCEG score recompute
  3. 2026-10-04 05:56 UTCGHSA enrichment
  4. 2026-10-02 09:49 UTCEG score recompute
  5. 2026-10-02 09:49 UTCGHSA enrichment
  6. 2026-10-01 19:49 UTCEPSS rescore
  7. 2026-10-01 01:50 UTCEG score recompute
  8. 2026-10-01 01:50 UTCGHSA enrichment
  9. 2026-09-30 15:02 UTCEPSS rescore
  10. 2026-09-29 15:20 UTCEPSS rescore
  11. 2026-09-29 06:06 UTCEG score recompute
  12. 2026-09-29 06:06 UTCGHSA enrichment
  13. 2026-09-27 17:37 UTCEG score recompute
  14. 2026-09-27 17:37 UTCGHSA enrichment
  15. 2026-09-27 13:47 UTCEPSS rescore
  16. 2026-09-26 15:58 UTCEPSS rescore
  17. 2026-09-25 07:37 UTCEG score recompute
  18. 2026-09-25 07:37 UTCGHSA enrichment
  19. 2026-09-24 05:41 UTCEG score recompute
  20. 2026-09-24 05:41 UTCGHSA enrichment
  21. 2026-09-23 03:16 UTCEG score recompute
  22. 2026-09-23 03:16 UTCGHSA enrichment
  23. 2026-09-22 01:20 UTCEG score recompute
  24. 2026-09-22 01:20 UTCGHSA enrichment
  25. 2026-09-20 20:46 UTCEG score recompute
Show 75 more
  1. 2026-09-20 20:46 UTCGHSA enrichment
  2. 2026-09-19 13:14 UTCEG score recompute
  3. 2026-09-19 13:14 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 07:09 UTCEG score recompute
  6. 2026-09-18 07:09 UTCGHSA enrichment
  7. 2026-09-17 05:12 UTCEG score recompute
  8. 2026-09-17 05:12 UTCGHSA enrichment
  9. 2026-09-16 14:07 UTCEPSS rescore
  10. 2026-09-16 05:14 UTCEPSS rescore
  11. 2026-09-16 03:16 UTCEG score recompute
  12. 2026-09-16 03:16 UTCGHSA enrichment
  13. 2026-09-15 01:19 UTCGHSA enrichment
  14. 2026-09-13 18:30 UTCEG score recompute
  15. 2026-09-13 18:30 UTCGHSA enrichment
  16. 2026-09-13 16:46 UTCEPSS rescore
  17. 2026-09-12 16:34 UTCEG score recompute
  18. 2026-09-12 16:34 UTCGHSA enrichment
  19. 2026-09-12 15:00 UTCEPSS rescore
  20. 2026-09-11 14:52 UTCEPSS rescore
  21. 2026-09-11 14:38 UTCEG score recompute
  22. 2026-09-11 14:38 UTCGHSA enrichment
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-10 09:34 UTCEPSS rescore
  25. 2026-09-10 08:13 UTCGHSA enrichment
  26. 2026-09-09 06:17 UTCEG score recompute
  27. 2026-09-09 06:16 UTCGHSA enrichment
  28. 2026-09-08 22:00 UTCEPSS rescore
  29. 2026-09-07 22:25 UTCEG score recompute
  30. 2026-09-07 22:25 UTCGHSA enrichment
  31. 2026-09-07 16:01 UTCEPSS rescore
  32. 2026-09-06 20:29 UTCEG score recompute
  33. 2026-09-06 20:29 UTCGHSA enrichment
  34. 2026-09-06 13:47 UTCEPSS rescore
  35. 2026-09-05 18:23 UTCEG score recompute
  36. 2026-09-05 18:23 UTCGHSA enrichment
  37. 2026-09-04 11:18 UTCEG score recompute
  38. 2026-09-04 11:18 UTCGHSA enrichment
  39. 2026-09-04 05:06 UTCEPSS rescore
  40. 2026-09-03 09:21 UTCEG score recompute
  41. 2026-09-03 09:21 UTCGHSA enrichment
  42. 2026-09-02 14:11 UTCEPSS rescore
  43. 2026-09-02 07:24 UTCEG score recompute
  44. 2026-09-02 07:24 UTCGHSA enrichment
  45. 2026-09-01 13:53 UTCEPSS rescore
  46. 2026-09-01 01:11 UTCGHSA enrichment
  47. 2026-08-30 23:10 UTCEG score recompute
  48. 2026-08-30 23:10 UTCGHSA enrichment
  49. 2026-08-30 19:17 UTCEPSS rescore
  50. 2026-08-30 01:22 UTCEPSS rescore
  51. 2026-08-29 21:14 UTCEG score recompute
  52. 2026-08-29 21:14 UTCGHSA enrichment
  53. 2026-08-28 21:41 UTCEPSS rescore
  54. 2026-08-28 00:55 UTCEG score recompute
  55. 2026-08-28 00:55 UTCGHSA enrichment
  56. 2026-08-27 14:25 UTCEPSS rescore
  57. 2026-08-26 22:42 UTCEG score recompute
  58. 2026-08-26 22:42 UTCGHSA enrichment
  59. 2026-08-26 14:46 UTCEPSS rescore
  60. 2026-08-25 20:43 UTCEG score recompute
  61. 2026-08-25 20:43 UTCGHSA enrichment
  62. 2026-08-25 13:48 UTCEPSS rescore
  63. 2026-08-24 18:29 UTCEG score recompute
  64. 2026-08-24 18:29 UTCGHSA enrichment
  65. 2026-08-23 16:33 UTCEG score recompute
  66. 2026-08-23 16:33 UTCGHSA enrichment
  67. 2026-08-23 00:19 UTCEPSS rescore
  68. 2026-08-22 14:37 UTCEG score recompute
  69. 2026-08-22 14:37 UTCGHSA enrichment
  70. 2026-08-21 23:49 UTCEPSS rescore
  71. 2026-08-21 12:41 UTCEG score recompute
  72. 2026-08-21 12:41 UTCGHSA enrichment
  73. 2026-08-20 22:55 UTCEPSS rescore
  74. 2026-08-20 10:44 UTCEG score recompute
  75. 2026-08-20 10:44 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-18998?
CVE-2026-18998 is a medium vulnerability published on August 6, 2026. A vulnerability was determined in cosmicstack-labs mercury-agent up to 1.1.12. Impacted is the function SubAgent.run of the file src/core/sub-agent.ts of the component delegate_task Tool. Executing a manipulation can lead to improper authorization. It is possible to launch the attack remotely. The…
When was CVE-2026-18998 disclosed?
CVE-2026-18998 was first published 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-2026-18998 actively exploited?
CVE-2026-18998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18998?
CVE-2026-18998 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18998?
No fix for CVE-2026-18998 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18998 are linked in the Vendor Advisories panel on this page.

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