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CVE-2026-47680— Source controller: Improper path handling allows traversal

Quick assessment

Affected
fluxcd source-controller
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

source-controller 是一个 Kubernetes 控制器（Operator），专门用于从外部源（如 Git、OCI、Helm 仓库和兼容 S3 的对象存储桶）获取制品（artifacts）。在 0.0.17 到 1.8.4 版本中，任何能够影响由 资源引用的桶内容的能力拥有者，都可以诱使 source-controller 将获取到的对象数据写入到每次协调（reconciliation）工作目录之外的路径。 该漏洞的影响范围受限于 source-controller 自身及下游 Flux 控制器的摘

CVSS 5.3 · Medium EPSS 0.05% · P17

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-47680

Vulnerability Information
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Vulnerability Title
Source controller: Improper path handling allows traversal
Source: CVE Program / CVE List V5
Vulnerability Description
The source-controller is a Kubernetes operator, specialised in artifacts acquisition from external sources such as Git, OCI, Helm repositories and S3-compatible buckets. In versions 0.0.17 through 1.8.4, an actor with the ability to influence the contents of a bucket referenced by a `Bucket` resource can cause source-controller to write fetched object data to paths outside the per-reconciliation working directory. The corruption surface is bounded by source-controller's own and downstream Flux controllers' digest verification: source-controller verifies stored artifact digests during reconciliation and rebuilds on divergence; consumers (kustomize-controller, helm-controller) verify the digest of fetched artifacts and reject mismatches. These checks prevent a manipulated artifact from reaching the cluster, but an attacker can still write files anywhere the source-controller pod has permission to write. Separately, a user with permission to create or update `GitRepository` resources can cause source-controller to test for the existence of paths outside the cloned repository. Because the result is exposed via the resource's status, this allows limited enumeration of file paths on the controller pod. This surface exists only on source-controller v1.6.0 and later, where the sparse-checkout feature was introduced. This vulnerability was fixed in source-controller v1.8.5. There is no in-product workaround. Users should upgrade to a patched version. As a defense-in-depth measure for the GitRepository sparse-checkout surface, a `ValidatingAdmissionPolicy` (or a third-party policy engine such as Kyverno or OPA Gatekeeper) can be deployed to reject `GitRepository` resources whose `.spec.sparseCheckout` entries contain `..` or absolute path segments.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fluxcd source-controller >= 0.0.17, < 1.8.5 -

II. Public POCs for CVE-2026-47680

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III. Intelligence Information for CVE-2026-47680

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Patches & Fixes for CVE-2026-47680 (2)

Vendor Advisories for CVE-2026-47680 (1)

IV. Related Vulnerabilities

Same product: source-controller
Same vendor: fluxcd
Same weakness: CWE-23

V. Comments for CVE-2026-47680

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