SB2026092279 - Multiple vulnerabilities in Argo Workflows

Description

This security bulletin contains information about 2 vulnerabilities.

1) Path traversal (CVE-ID: N/A)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to improper limitation of a pathname to a restricted directory in the directory artifact materialization functionality of the S3, GCS, Azure Blob, and OSS artifact drivers when downloading directory artifacts from cloud object storage. A remote user can provide a crafted cloud object key containing directory traversal sequences to execute arbitrary code.

Exploitation requires a workflow configured to use a directory input artifact.

2) Authorization bypass through user-controlled key (CVE-ID: CVE-2026-93991)

CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to improper authorization in the ListArchivedWorkflows handler when processing metadata.namespace!= field selectors. A remote user can submit a crafted archived-workflow list request to disclose sensitive information.

Exploitation requires namespace-scoped permission to list workflows in a namespace controlled by the user.

Remediation

Install update from vendor's website.

References

• https://github.com/argoproj/argo-workflows/security/advisories/GHSA-vm9v-p987-xm32
• https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4
• https://github.com/argoproj/argo-workflows/commit/82eec0304