CVE-2026-10222 NousResearch hermes-agent config.py _sanitize_env_lines injection
Remote attackers can inject code via the _sanitize_env_lines function in NousResearch hermes-agent, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10222?
CVE-2026-10222 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 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.
Which versions are affected by CVE-2026-10222?
3 open source packages ship an affected version, including hermes-agent.
| Package | Affected | Fixed in |
|---|---|---|
hermes-agent PyPI | All versions | 0.18.0 |
hermes-agent PyPI | All versions | 0.18.0 |
hermes-agent PyPI | All versions | 0.18.0 |
How do I fix CVE-2026-10222?
Upgrade hermes-agent to 0.18.0 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-10222 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10222 exists.
Sources
Also known as GHSA-mv8x-fg99-32mf, PYSEC-2026-2513.