CVE-2026-10222: Hermes agent Hermes-agent Has An Injection Issue Vulnerability

LOW
Advisory Identifier: GHSA-mv8x-fg99-32mf
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CVSS 5.6
CWE-74
Published
Advisory Summary

CVE-2026-10222 is a LOW (CVSS 5.6) hermes-agent has an injection issue vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Hermes agent libraries in the PyPI ecosystem. The issue involves hermes-agent has an injection issue. Remediation is available by upgrading affected packages to version 0.18.0.

CVE-2026-10222 at a Glance

CVE Identifier CVE-2026-10222
GHSA Identifier GHSA-mv8x-fg99-32mf
Severity LOW
CVSS v3.1 Base Score 5.6
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Hermes agent
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.6

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2026-10222

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: 0.18.0 
pip install hermes-agent>=0.18.0
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-2026-10222, 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 0.18.0), 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-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. 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 security flaw has been discovered in NousResearch hermes-agent up to 2026.4.30. Affected by this issue is the function _sanitize_env_lines of the file hermes_cli/config.py. The manipulation results in injection. It is possible to launch the attack remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-10222 Affected Hermes agent Versions

1 component(s)
Fixed Versions:
0.18.0
Product / Package Ecosystem Affected Versions Fixed Version
hermes-agent
pypi/hermes-agent
PyPI
< 0.18.0
0.18.0

References

NVD — CVE-2026-10222 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-10222
Security Fix Commit FIX COMMIT
https://github.com/NousResearch/hermes-agent/commit/b944c6e821c2177eac6da857c99ff24566aa56b0
Hermes agent Source Repository REPOSITORY
https://gist.github.com/YLChen-007/7ee2eeaa383b3540d2e8854250c03fb0
Hermes agent Source Repository REPOSITORY
https://github.com/NousResearch/hermes-agent
Hermes agent Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/hermes-agent/PYSEC-2026-2513.yaml
vuldb.com/cve/cve-2026-10222 WEB
https://vuldb.com/cve/CVE-2026-10222
vuldb.com/submit/822020 WEB
https://vuldb.com/submit/822020
vuldb.com/vuln/367501 WEB
https://vuldb.com/vuln/367501
vuldb.com/vuln/367501/cti WEB
https://vuldb.com/vuln/367501/cti

Frequently Asked Questions

What is CVE-2026-10222?
CVE-2026-10222 is a security vulnerability in Hermes agent involving hermes-agent has an Injection issue under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Hermes agent versions are affected?
Affected versions include releases prior to 0.18.0 across affected packages: hermes-agent.
What version fixes CVE-2026-10222?
Upgrading to 0.18.0 (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 0.18.0. Upgrade your dependency to 0.18.0 or later.
What is the CVSS score of CVE-2026-10222?
CVE-2026-10222 has a CVSS v3.1 base score of 5.6 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-10222?
CVE-2026-10222 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2026-10222?
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-mv8x-fg99-32mf",
  "modified" : "2026-07-28T19:10:41Z",
  "published" : "2026-06-01T06:30:26Z",
  "aliases" : [ "CVE-2026-10222" ],
  "summary" : "hermes-agent has an Injection issue",
  "details" : "A security flaw has been discovered in NousResearch hermes-agent up to 2026.4.30. Affected by this issue is the function _sanitize_env_lines of the file hermes_cli/config.py. The manipulation results in injection. It is possible to launch the attack remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit has been released to the public and may be used for attacks. 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:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/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" : "0.18.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-10222"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/NousResearch/hermes-agent/commit/b944c6e821c2177eac6da857c99ff24566aa56b0"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/YLChen-007/7ee2eeaa383b3540d2e8854250c03fb0"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/NousResearch/hermes-agent"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/hermes-agent/PYSEC-2026-2513.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-10222"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/822020"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/367501"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/367501/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-09T21:10:28Z",
    "nvd_published_at" : "2026-06-01T06:16:36Z"
  }
}