CVE-2026-54533 Overview
CVE-2026-54533 affects vantage6, an open-source infrastructure for privacy-preserving federated analysis. Versions prior to 5.0.0 allow malicious algorithm containers running on a node to access input and output files belonging to other algorithms executing on the same node. The flaw is classified as an improper access control issue [CWE-284] and breaks the isolation guarantees that vantage6 nodes rely on when executing third-party algorithm code. Version 5.0.0 resolves the issue. Operators who cannot upgrade should restrict which algorithm containers are permitted to run on each node.
Critical Impact
Malicious algorithm containers running on a vantage6 node can read input and output files of co-located algorithms, leading to disclosure of data intended to remain isolated between federated computations.
Affected Products
- vantage6 versions prior to 5.0.0
- vantage6 node deployments running untrusted or unverified algorithm containers
- Federated analysis environments built on vantage6 infrastructure
Discovery Timeline
- 2026-06-17 - CVE-2026-54533 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-54533
Vulnerability Analysis
vantage6 nodes execute algorithm containers that process sensitive data inside federated learning workflows. Each algorithm receives input files and writes output files to locations managed by the node. The vulnerability stems from insufficient isolation between concurrent or sequential algorithm containers on the same node. A malicious algorithm container can reach files belonging to other algorithms, breaking the confidentiality boundary that vantage6 enforces between separate computations. This undermines the privacy-preserving design goal of the platform, because input data and computed outputs may include sensitive information drawn from federated datasets. The issue is tracked in the project's GitHub Security Advisory GHSA-x9f6-9rvm-mmrg and GitHub Vantage6 Issue #1932.
Root Cause
The root cause is improper access control [CWE-284] on the file paths used to stage algorithm input and output. Algorithm containers share a mount or directory layout that does not enforce strict per-algorithm boundaries, allowing one container to read files written for another. The fix in version 5.0.0 reworks how the node assigns and isolates these paths.
Attack Vector
An attacker delivers a crafted algorithm to a vantage6 node by submitting a task that references a malicious container image. Once the node pulls and executes the container, the algorithm reads input and output files of other algorithms accessible on the node. Exploitation requires the ability to submit algorithms to the federation, which is the normal usage pattern for vantage6 participants. Refer to the Vantage6 Node Security Documentation for the intended trust model.
No verified public exploit code is available. The vulnerability mechanism is described in the project's security advisory linked above.
Detection Methods for CVE-2026-54533
Indicators of Compromise
- Algorithm containers performing file reads or directory traversal outside their expected working directory on the node.
- Unexpected outbound connections from algorithm containers transmitting data unrelated to their declared task.
- Algorithm images sourced from registries or publishers not on the node's allow-list.
Detection Strategies
- Audit node logs for tasks that reference algorithm images outside an approved allow-list, and correlate them with file access patterns.
- Inspect container runtime telemetry for processes accessing files under input or output directories assigned to other algorithm runs.
- Review historical task submissions for repeated runs of unverified algorithms by the same organization or user.
Monitoring Recommendations
- Enable verbose node logging for algorithm execution and retain logs centrally for retrospective analysis.
- Monitor the integrity of input and output directories with file integrity monitoring (FIM) tooling.
- Track which container images run on each node and alert on first-seen images.
How to Mitigate CVE-2026-54533
Immediate Actions Required
- Upgrade all vantage6 nodes to version 5.0.0 or later, as documented in the GitHub Vantage6 Release Notes 5.0.0.
- Review the list of organizations and users permitted to submit algorithms to your federation and revoke unnecessary access.
- Audit recent algorithm executions for unfamiliar images or anomalous file access.
Patch Information
vantage6 version 5.0.0 fixes the access control issue. The release is published on the project's GitHub repository, and details are available in the GitHub Security Advisory GHSA-x9f6-9rvm-mmrg.
Workarounds
- Verify and restrict the algorithm containers allowed to run on each node by configuring an explicit allow-list of trusted images.
- Limit algorithm submission privileges to vetted organizations until all nodes are upgraded.
- Apply the node hardening recommendations described in the Vantage6 Node Security Documentation.
# Configuration example: enable allow-listed algorithms in the node configuration
# (refer to the official vantage6 node configuration reference for exact syntax)
allowed_algorithms:
- harbor2.vantage6.ai/demo/average
- harbor2.vantage6.ai/your-org/verified-algorithm:1.2.3
policies:
allowed_algorithms_only: true
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
