CVE-2026-18993

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 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
6.3(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
12%
KEV
Not listed

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 18× in last 7d / 48× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 14:19 UTCEG score recompute
  3. 2026-08-20 14:19 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 14:49 UTCGHSA enrichment
  6. 2026-08-18 15:43 UTCEG score recompute
  7. 2026-08-18 15:43 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 16:09 UTCEG score recompute
  10. 2026-08-17 16:09 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 17:09 UTCEG score recompute
  13. 2026-08-16 17:09 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 18:09 UTCGHSA enrichment
  17. 2026-08-14 19:08 UTCEG score recompute
  18. 2026-08-14 19:08 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 20:07 UTCGHSA enrichment
  21. 2026-08-12 21:07 UTCEG score recompute
  22. 2026-08-12 21:07 UTCGHSA enrichment
  23. 2026-08-12 13:50 UTCEPSS rescore
  24. 2026-08-12 08:31 UTCEG score recompute
  25. 2026-08-12 08:31 UTCGHSA enrichment
Show 23 more
  1. 2026-08-11 13:42 UTCEPSS rescore
  2. 2026-08-11 09:31 UTCEG score recompute
  3. 2026-08-11 09:31 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 10:31 UTCEG score recompute
  6. 2026-08-10 10:31 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-09 11:30 UTCEG score recompute
  9. 2026-08-09 11:30 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-08 12:29 UTCGHSA enrichment
  12. 2026-08-07 13:28 UTCGHSA enrichment
  13. 2026-08-06 14:28 UTCEG score recompute
  14. 2026-08-06 14:28 UTCGHSA enrichment
  15. 2026-08-06 14:27 UTCNVD updateCVSS v4 → 2.1
  16. 2026-08-06 13:53 UTCEG score recompute
  17. 2026-08-06 13:53 UTCGHSA enrichment
  18. 2026-08-06 13:52 UTCMITRE cvelistV5CVSS v4 → 5.3
  19. 2026-08-06 13:46 UTCEPSS rescore
  20. 2026-08-06 05:25 UTCEG score recompute
  21. 2026-08-06 05:25 UTCNVD updateCVSS v4 → 2.1
  22. 2026-08-06 04:25 UTCEG score recompute
  23. 2026-08-06 04:25 UTCMITRE cvelistV5first tracked

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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 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-2026-18993 actively exploited?
CVE-2026-18993 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 87.9% of all scored CVEs.
What is the CVSS score of CVE-2026-18993?
CVE-2026-18993 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-18993?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18993, 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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