---
title: "CVE-2026-44935: Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer"
url: https://erroneo.us/security/cve/CVE-2026-44935/
description: "CVE-2026-44935 (github.com/rancher/fleet (Go)): Missing validation of \"valuesFrom\" references in Helm Deployer of SUSE Rancher Fleet 0.15 before 0.15.2…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-02
date_modified: 2026-07-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44935"
kev: false
cvss: 9.9
epss: 0.0049
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (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 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/rancher/fleet (Go) >= 0.15.0, < 0.15.2, fixed in 0.15.2 ; github.com/rancher/fleet (Go) >= 0.14.0, < 0.14.6, fixed in 0.14.6 ; github.com/rancher/fleet (Go) >= 0.13.0, < 0.13.11, fixed in 0.13.11 ; github.com/rancher/fleet (Go) >= 0.12.0, < 0.12.15, fixed in 0.12.15 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/rancher/fleet` >= 0.15.0, < 0.15.2 → fixed: 0.15.2
- Go `github.com/rancher/fleet` >= 0.14.0, < 0.14.6 → fixed: 0.14.6
- Go `github.com/rancher/fleet` >= 0.13.0, < 0.13.11 → fixed: 0.13.11
- Go `github.com/rancher/fleet` >= 0.12.0, < 0.12.15 → fixed: 0.12.15

## Affected products (CVE record)

- SUSE Rancher: 0.15.0 < 0.15.2, 0.14.0 < 0.14.6, 0.13.0 < 0.13.11, 0.12.0 < 0.12.15

## Severity

- suse CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A: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): 0.49% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [github.com](https://github.com/rancher/fleet/security/advisories/GHSA-xr65-5cpm-g36x)
- [GitHub Advisory GHSA-xr65-5cpm-g36x](https://github.com/advisories/GHSA-xr65-5cpm-g36x)
- [CVE.org record CVE-2026-44935](https://www.cve.org/CVERecord?id=CVE-2026-44935)
- [NVD entry CVE-2026-44935](https://nvd.nist.gov/vuln/detail/CVE-2026-44935)

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Source page: https://erroneo.us/security/cve/CVE-2026-44935/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt