CVE-2026-40886
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From 3.6.5 to 4.0.4, an unchecked array index in the pod informer's podGCFromPod() function causes a controller-wide panic when a workflow pod carries a malformed workflows.argoproj.io/pod-gc-strategy annotation. Because the panic occurs inside an informer goroutine (outside the controller's recover() scope), it crashes the entire controller process. The poisoned pod persists across restarts, causing a crash loop that halts all workflow processing until the pod is manually deleted. This vulnerability is fixed in 4.0.5 and 3.7.14.
- CVSS 3.1
- 7.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H - EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-26)
- CWEs
- CWE-129, CWE-1285
- Published
- Modified
- Record from
- the NVD, synced
Affected
- argoproj:argo_workflows
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5jv8-h7qh-rf5p | Go | github.com/argoproj/argo-workflows/v4 | >=4.0.0 <4.0.5 | 4.0.5 |
| GHSA-5jv8-h7qh-rf5p | Go | github.com/argoproj/argo-workflows/v3 | >=3.7.0 <3.7.14 | 3.7.14 |
| GHSA-5jv8-h7qh-rf5p | Go | github.com/argoproj/argo-workflows/v3 | >=3.6.5 <=3.6.19 | no fix published |
| GO-2026-5148 | Go | github.com/argoproj/argo-workflows | all versions | no fix published |
| GO-2026-5148 | Go | github.com/argoproj/argo-workflows/v2 | all versions | no fix published |
| GO-2026-5148 | Go | github.com/argoproj/argo-workflows/v3 | >=3.6.5 | no fix published |
| GO-2026-5148 | Go | github.com/argoproj/argo-workflows/v3 | >=3.7.0 <3.7.14 | 3.7.14 |
| GO-2026-5148 | Go | github.com/argoproj/argo-workflows/v4 | >=4.0.0 <4.0.5 | 4.0.5 |
References
- https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p
- https://access.redhat.com/security/cve/CVE-2026-40886
- https://bugzilla.redhat.com/show_bug.cgi?id=2461236
- https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json