---
title: "CVE-2026-44939: Rancher vulnerable to command injection through unsanitized YAML parameter"
url: https://erroneo.us/security/cve/CVE-2026-44939/
description: "CVE-2026-44939 (github.com/rancher/rancher (Go)): A command injection vulnerability in the Rancher Manager cluster before 2.14.2 import endpoint…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-19
date_modified: 2026-08-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44939"
kev: false
cvss: 9.4
epss: 0.01313
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44939: Rancher vulnerable to command injection through unsanitized YAML parameter

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.3% , percentile 70: FIRST’s model estimates a 1.3% chance of exploitation activity in the next 30 days, higher than 70% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Only applies if your dependency tree includes github.com/rancher/rancher (Go) >= 2.14.0, < 2.14.2, fixed in 2.14.2 ; github.com/rancher/rancher (Go) >= 2.13.0, < 2.13.6, fixed in 2.13.6 ; github.com/rancher/rancher (Go) >= 2.12.0, < 2.12.10, fixed in 2.12.10 ; github.com/rancher/rancher (Go) >= 2.11.0, < 2.11.14, fixed in 2.11.14 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/rancher/rancher` >= 2.14.0, < 2.14.2 → fixed: 2.14.2
- Go `github.com/rancher/rancher` >= 2.13.0, < 2.13.6 → fixed: 2.13.6
- Go `github.com/rancher/rancher` >= 2.12.0, < 2.12.10 → fixed: 2.12.10
- Go `github.com/rancher/rancher` >= 2.11.0, < 2.11.14 → fixed: 2.11.14
- Go `github.com/rancher/rancher` >= 2.10.0, < 2.10.12 → fixed: 2.10.12
- Go `github.com/rancher/rancher` < 0.0.0-20260617231817-2aa77eb283e7 → fixed: 0.0.0-20260617231817-2aa77eb283e7

## Affected products (CVE record)

- SUSE Rancher: 2.14.0 < 2.14.2, 2.13.0 < 2.13.6, 2.12.0 < 2.12.10, 2.11.0 < 2.11.14, 2.10.0 < 2.10.12

## Severity

- suse CVSS 4.0: 9.4 `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`
- GitHub CVSS 4.0: 9.4 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.31% probability of exploitation activity in the next 30 days; percentile 70.

## Sources

- [github.com](https://github.com/rancher/rancher/security/advisories/GHSA-mhc6-2gfq-xx62)
- [GitHub Advisory GHSA-mhc6-2gfq-xx62](https://github.com/advisories/GHSA-mhc6-2gfq-xx62)
- [CVE.org record CVE-2026-44939](https://www.cve.org/CVERecord?id=CVE-2026-44939)
- [NVD entry CVE-2026-44939](https://nvd.nist.gov/vuln/detail/CVE-2026-44939)
- [github.com](https://github.com/rancher/rancher/commit/2aa77eb283e7451d605fb85e1bd9b1791cd73875)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44939/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt