# CVE-2026-47680 — fluxcd source-controller

> As of 2026-09-09, CVE-2026-47680 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in fluxcd source-controller, CVSS v4.0 5.3, EPSS 0.3% (25.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-47680 as of 2026-09-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-09

## What is CVE-2026-47680?

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.

The record classifies CVE-2026-47680 under weakness class [CWE-23](https://intel.threadlinqs.com/cwe/CWE-23). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 27 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 5.3 — Medium (derived from score) (`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`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 25.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-08, last modified 2026-09-09

## Is CVE-2026-47680 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **fluxcd**: source-controller

## How to fix CVE-2026-47680

No vendor patch reference has been recorded for CVE-2026-47680 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-47680

No threat campaign in the Threadlinqs corpus currently references CVE-2026-47680, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-09-09. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/fluxcd/source-controller/security/advisories/GHSA-jjrm-hr5f-673x)

**Other references**

- [github.com](https://github.com/fluxcd/source-controller/pull/2054)
- [github.com (759bd6c451e7cc4327b38f42c8b671980165cb0e)](https://github.com/fluxcd/source-controller/commit/759bd6c451e7cc4327b38f42c8b671980165cb0e)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-47680
Full detection coverage and IOCs for threats exploiting CVE-2026-47680 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp