CVE-2026-18993

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 detected in NousResearch hermes-agent up to 0.16.0. Affected by this issue is some unknown functionality of the file hermes-agent/model_tools.py of the component Memory Toolset. The manipulation results in improper access controls. The attack can be executed remotely. The exploit is now public and may be used.

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
29th
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 (4)

Auto-updated Aug 6, 2026
No patch confirmed yet. Sources: github_pr.
github_pr

fix(agent): respect disabled_toolsets for memory provider tool injection (#46171)

Upstream fix in progress (PR #46185 · NousResearch/hermes-agent, state=open)

https://github.com/NousResearch/hermes-agent/pull/46185
generic

[Security] Disabled `memory` toolsets can be bypassed by late memory-provider tool injection · Issue #48181 · NousResearch/hermes-agent · GitHub

https://github.com/NousResearch/hermes-agent/issues/48181
generic

[Security] Hermes Agent memory provider tools bypass `disabled_toolsets` and remain callable after final tool filtering · Issue #46171 · NousResearch/hermes-agent · GitHub

https://github.com/NousResearch/hermes-agent/issues/46171
generic

GitHub - NousResearch/hermes-agent: The agent that grows with you · GitHub

https://github.com/NousResearch/hermes-agent/

Vendor Advisories for CVE-2026-18993(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 13× in last 7d / 63× 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 152 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. 2026-09-28 13:51 UTCEPSS rescore
  14. 2026-09-27 17:37 UTCEG score recompute
  15. 2026-09-27 17:37 UTCGHSA enrichment
  16. 2026-09-27 13:47 UTCEPSS rescore
  17. 2026-09-26 15:58 UTCEPSS rescore
  18. 2026-09-25 09:56 UTCEG score recompute
  19. 2026-09-25 09:56 UTCGHSA enrichment
  20. 2026-09-24 10:56 UTCEG score recompute
  21. 2026-09-24 10:56 UTCGHSA enrichment
  22. 2026-09-23 11:56 UTCEG score recompute
  23. 2026-09-23 11:56 UTCGHSA enrichment
  24. 2026-09-22 12:56 UTCEG score recompute
  25. 2026-09-22 12:56 UTCGHSA enrichment
Show 75 more
  1. 2026-09-21 13:02 UTCEG score recompute
  2. 2026-09-21 13:02 UTCGHSA enrichment
  3. 2026-09-19 23:14 UTCEG score recompute
  4. 2026-09-19 23:14 UTCGHSA enrichment
  5. 2026-09-19 00:11 UTCEG score recompute
  6. 2026-09-19 00:11 UTCGHSA enrichment
  7. 2026-09-18 19:27 UTCEPSS rescore
  8. 2026-09-18 01:10 UTCEG score recompute
  9. 2026-09-18 01:10 UTCGHSA enrichment
  10. 2026-09-17 02:10 UTCEG score recompute
  11. 2026-09-17 02:10 UTCGHSA enrichment
  12. 2026-09-16 14:07 UTCEPSS rescore
  13. 2026-09-16 05:14 UTCEPSS rescore
  14. 2026-09-16 03:09 UTCEG score recompute
  15. 2026-09-16 03:09 UTCGHSA enrichment
  16. 2026-09-15 01:19 UTCGHSA enrichment
  17. 2026-09-14 01:47 UTCEG score recompute
  18. 2026-09-14 01:47 UTCGHSA enrichment
  19. 2026-09-13 16:46 UTCEPSS rescore
  20. 2026-09-13 02:47 UTCEG score recompute
  21. 2026-09-13 02:47 UTCGHSA enrichment
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 03:46 UTCEG score recompute
  24. 2026-09-12 03:46 UTCGHSA enrichment
  25. 2026-09-11 14:52 UTCEPSS rescore
  26. 2026-09-11 04:45 UTCEG score recompute
  27. 2026-09-11 04:45 UTCGHSA enrichment
  28. 2026-09-10 09:34 UTCEPSS rescore
  29. 2026-09-10 05:32 UTCGHSA enrichment
  30. 2026-09-09 06:17 UTCEG score recompute
  31. 2026-09-09 06:17 UTCGHSA enrichment
  32. 2026-09-08 22:00 UTCEPSS rescore
  33. 2026-09-07 18:08 UTCEG score recompute
  34. 2026-09-07 18:08 UTCGHSA enrichment
  35. 2026-09-07 16:01 UTCEPSS rescore
  36. 2026-09-06 13:47 UTCEPSS rescore
  37. 2026-09-06 07:28 UTCEG score recompute
  38. 2026-09-06 07:28 UTCGHSA enrichment
  39. 2026-09-05 08:26 UTCEG score recompute
  40. 2026-09-05 08:26 UTCGHSA enrichment
  41. 2026-09-04 09:25 UTCEG score recompute
  42. 2026-09-04 09:25 UTCGHSA enrichment
  43. 2026-09-04 05:06 UTCEPSS rescore
  44. 2026-09-03 06:36 UTCEG score recompute
  45. 2026-09-03 06:36 UTCGHSA enrichment
  46. 2026-09-02 14:11 UTCEPSS rescore
  47. 2026-09-01 22:06 UTCEG score recompute
  48. 2026-09-01 22:05 UTCGHSA enrichment
  49. 2026-09-01 13:53 UTCEPSS rescore
  50. 2026-09-01 04:39 UTCEPSS rescore
  51. 2026-08-31 22:44 UTCGHSA enrichment
  52. 2026-08-30 20:15 UTCEG score recompute
  53. 2026-08-30 20:15 UTCGHSA enrichment
  54. 2026-08-30 19:17 UTCEPSS rescore
  55. 2026-08-30 01:22 UTCEPSS rescore
  56. 2026-08-29 21:14 UTCEG score recompute
  57. 2026-08-29 21:14 UTCGHSA enrichment
  58. 2026-08-28 21:41 UTCEPSS rescore
  59. 2026-08-28 12:10 UTCEG score recompute
  60. 2026-08-28 12:10 UTCGHSA enrichment
  61. 2026-08-27 14:25 UTCEPSS rescore
  62. 2026-08-27 07:58 UTCEG score recompute
  63. 2026-08-27 07:58 UTCGHSA enrichment
  64. 2026-08-26 14:46 UTCEPSS rescore
  65. 2026-08-26 08:39 UTCEG score recompute
  66. 2026-08-26 08:39 UTCGHSA enrichment
  67. 2026-08-25 13:48 UTCEPSS rescore
  68. 2026-08-25 09:37 UTCEG score recompute
  69. 2026-08-25 09:37 UTCGHSA enrichment
  70. 2026-08-24 10:36 UTCEG score recompute
  71. 2026-08-24 10:36 UTCGHSA enrichment
  72. 2026-08-23 11:35 UTCEG score recompute
  73. 2026-08-23 11:35 UTCGHSA enrichment
  74. 2026-08-23 00:19 UTCEPSS rescore
  75. 2026-08-22 12:35 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-18993?
CVE-2026-18993 is a medium vulnerability published on August 6, 2026. A vulnerability was detected in NousResearch hermes-agent up to 0.16.0. Affected by this issue is some unknown functionality of the file hermes-agent/model_tools.py of the component Memory Toolset. The manipulation results in improper access controls. The attack can be executed remotely. The…
When was CVE-2026-18993 disclosed?
CVE-2026-18993 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-2026-18993 actively exploited?
CVE-2026-18993 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18993?
CVE-2026-18993 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-2026-18993?
No fix for CVE-2026-18993 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-2026-18993 are linked in the Vendor Advisories panel on this page.

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