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CVE-2026-44935 is a critical authorization flaw in the Helm Deployer component of SUSE Rancher Fleet caused by missing validation of valuesFrom references. In affected versions, a tenant owner can supply valuesFrom references that are not properly constrained to the intended namespace or tenant boundary. In multi-tenant downstream Kubernetes cluster deployments, this allows a malicious tenant to bypass Fleet isolation controls and reference arbitrary ConfigMaps or Secrets across namespaces. The issue affects 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. Supporting reporting also indicates the flaw can be abused through Helm operations to create cluster-wide resources without proper administrative approval.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
GitRepos, HelmOps, and Bundles, and restrict HelmOp repository and chart URLs using anchored regular expressions. After patching, review whether any cross-tenant secrets, service accounts, or Fleet credentials may have been exposed and rotate them as appropriate.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical cross-namespace secret disclosure vulnerability in SUSE Rancher Fleet Helm Deployer caused by missing validation of `valuesFrom` references, allowing one tenant to access another tenant's fleet credentials.
A critical cross-namespace secret disclosure and tenant-isolation bypass in Fleet's Helm deployer that allows malicious tenants to access config maps or secrets across namespaces and create cluster-wide resources.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.