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MEDIUM severity

CVE-2026-10223 — hermes-agent

MEDIUMFix: NousResearch/hermes-agent@0dee92d

CVE-2026-10223 is a medium-severity (CVSS 6.3) CWE-74 vulnerability in hermes-agent. A fix is available for hermes-agent — see the affected versions and patch details below.

hermes-agent has an Injection issue

Also known asPYSEC-2026-3575
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-10223.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs14th percentile — riskier than 14% of all scored CVEsHighest risk
0.00%0.24%0.49%0.73%0.0%0.2%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍hermes-agent

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

A weakness has been identified in NousResearch hermes-agent up to 2026.4.30. This affects the function _scan_memory_content of the file tools/memory_tool.py. This manipulation causes injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIhermes-agentall versions0.15.0pip install --upgrade 'hermes-agent==0.15.0'

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hermes-agent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update hermes-agent to 0.15.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-10223 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

A weakness has been identified in NousResearch hermes-agent up to 2026.4.30. This affects the function _scan_memory_content of the file tools/memory_tool.py. This manipulation causes injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
O3 Security · Impact-Aware SCA

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CVE-2026-10223: hermes-agent — Fixed in 0.15.0