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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.

Flux CD project Source controller是Flux CD project组织开源的一款源码控制器。 Flux CD project Source controller 0.0.17版本至1.8.4版本存在安全漏洞，该漏洞源于路径验证不当，可能导致攻击者将获取的对象数据写入工作目录之外的路径，以及通过GitRepository资源枚举控制器Pod上的文件路径。

CVSS 5.3 · Medium EPSS 0.46% · P39

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
fluxcd source-controller >= 0.0.17, < 1.8.5 affected
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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
Vulnerability Title
Flux CD project Source controller 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flux CD project Source controller是Flux CD project组织开源的一款源码控制器。 Flux CD project Source controller 0.0.17版本至1.8.4版本存在安全漏洞，该漏洞源于路径验证不当，可能导致攻击者将获取的对象数据写入工作目录之外的路径，以及通过GitRepository资源枚举控制器Pod上的文件路径。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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