CVE-2026-9368: Hermes agent Hermes-agent Has A Sandbox Issue Vulnerability

MODERATE
Advisory Identifier: GHSA-wm96-9gfh-vvgq
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CVSS 7.3
CWE-269 CWE-526
Published
Advisory Summary

CVE-2026-9368 is a MODERATE (CVSS 7.3) hermes-agent has a sandbox issue vulnerability (CWE-269: Improper Privilege Management) affecting Hermes agent libraries in the PyPI ecosystem. The issue involves hermes-agent has a sandbox issue. Remediation is available by upgrading affected packages to version 0.11.0.

CVE-2026-9368 at a Glance

CVE Identifier CVE-2026-9368
GHSA Identifier GHSA-wm96-9gfh-vvgq
Severity MODERATE
CVSS v3.1 Base Score 7.3
CWE Classification CWE-269: Improper Privilege Management
Affected Product Hermes agent
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-9368

To remediate this vulnerability, upgrade all affected Hermes agent dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

hermes-agent fixed: 0.11.0 
pip install hermes-agent>=0.11.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show hermes-agent

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-9368, inspect your installed packages using pip:

pip show hermes-agent

Analyze the terminal output to locate any version of Hermes agent in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.0), your application is affected.

Note: The pip show hermes-agent command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. In Hermes agent, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability was identified in NousResearch hermes-agent up to 2026.4.16. This impacts the function execute_code of the file tools/code_execution_tool.py of the component Environment Variable Handler. Such manipulation leads to sandbox issue. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-9368 Affected Hermes agent Versions

1 component(s)
Fixed Versions:
0.11.0
Product / Package Ecosystem Affected Versions Fixed Version
hermes-agent
pypi/hermes-agent
PyPI
< 0.11.0
0.11.0

References

NVD — CVE-2026-9368 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9368
Security Fix Commit FIX COMMIT
https://github.com/NousResearch/hermes-agent/commit/285bb2b9150b93445e5eded9bc897a4001b66e55
Hermes agent Source Repository REPOSITORY
https://gist.github.com/YLChen-007/43c72d19668421abe8ce10f299323a0a
Hermes agent Source Repository REPOSITORY
https://github.com/NousResearch/hermes-agent
vuldb.com/submit/812229 WEB
https://vuldb.com/submit/812229
vuldb.com/vuln/365331 WEB
https://vuldb.com/vuln/365331
vuldb.com/vuln/365331/cti WEB
https://vuldb.com/vuln/365331/cti

Frequently Asked Questions

What is CVE-2026-9368?
CVE-2026-9368 is a security vulnerability in Hermes agent involving hermes-agent has a sandbox issue under CWE-269: Improper Privilege Management.
Which Hermes agent versions are affected?
Affected versions include releases prior to 0.11.0 across affected packages: hermes-agent.
What version fixes CVE-2026-9368?
Upgrading to 0.11.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hermes-agent affected?
Yes, hermes-agent is affected in releases prior to 0.11.0. Upgrade your dependency to 0.11.0 or later.
What is the CVSS score of CVE-2026-9368?
CVE-2026-9368 has a CVSS v3.1 base score of 7.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-9368?
CVE-2026-9368 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check PyPI dependencies for CVE-2026-9368?
Run the dependency tree command: 'pip show hermes-agent'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wm96-9gfh-vvgq",
  "modified" : "2026-06-30T15:37:24Z",
  "published" : "2026-05-26T13:30:32Z",
  "aliases" : [ "CVE-2026-9368" ],
  "summary" : "hermes-agent has a sandbox issue",
  "details" : "A vulnerability was identified in NousResearch hermes-agent up to 2026.4.16. This impacts the function execute_code of the file tools/code_execution_tool.py of the component Environment Variable Handler. Such manipulation leads to sandbox issue. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "hermes-agent"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9368"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/NousResearch/hermes-agent/commit/285bb2b9150b93445e5eded9bc897a4001b66e55"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/YLChen-007/43c72d19668421abe8ce10f299323a0a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/NousResearch/hermes-agent"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/812229"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/365331"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/365331/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269", "CWE-526" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T15:37:24Z",
    "nvd_published_at" : "2026-05-24T09:16:32Z"
  }
}