# CVE-2026-10220: NousResearch hermes-agent skills_tool.py skill_view injection

> Remote attackers can execute arbitrary code via injection in the skill_view function of the hermes-agent library.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-vq96-9529-5crp

## What is CVE-2026-10220?

CVE-2026-10220 is a medium-severity code injection vulnerability in NousResearch hermes-agent, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was determined in NousResearch hermes-agent up to 2026.4.30. Affected is the function _serve_plugin_skill/skill_view of the file tools/skills_tool.py. Executing a manipulation can lead to injection. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), CWE-707 (Improper Neutralization)

## Which versions are affected by CVE-2026-10220?


## How do I fix CVE-2026-10220?

No fix has been published for CVE-2026-10220 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-10220 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10220 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-10220 and fix it if it is affected.

What it is: CVE-2026-10220 is a medium-severity code injection vulnerability in NousResearch hermes-agent, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10220 exists.

Affected product: NousResearch hermes-agent. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-10220/ (Markdown: https://insights.sbomify.com/CVE-2026-10220/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-10220
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-10220
- OSV: https://osv.dev/vulnerability/CVE-2026-10220

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-10220/
Summaries are generated and may contain mistakes; the official description above is the record.