What is CVE-2026-28229?
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to 4.0.2 and 3.7.11, Workflow templates endpoints allow any client to retrieve WorkflowTemplates (and ClusterWorkflowTemplates). Any request with a Authorization: Bearer nothing token can leak sensitive template content, including embedded Secret manifests. This vulnerability is fixed in 4.0.2 and 3.7.11.
The record classifies CVE-2026-28229 under weakness classes CWE-863, CWE-306. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 230 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.8% probability of exploitation in the next 30 days, higher than 55.7% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 9.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-03-11, last modified 2026-07-15
Is CVE-2026-28229 being exploited?
Weaponised exploit code for CVE-2026-28229 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 27 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- argoproj: argo-workflows
Affected software packages:
go:github.com/argoproj/argo-workflows/v4— patched in 4.0.2go:github.com/argoproj/argo-workflows/v3— patched in 3.7.11
How to fix CVE-2026-28229
Fixed versions are recorded for 2 packages: go:github.com/argoproj/argo-workflows/v4 4.0.2, go:github.com/argoproj/argo-workflows/v3 3.7.11. No vendor patch reference has been recorded for CVE-2026-28229 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-2026-28229
1 tracked threat in the Threadlinqs corpus references CVE-2026-28229, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .