What is CVE-2026-40886?

CVE-2026-40886 is a high-severity vulnerability in Argoproj Argo-workflows, classified under Improper Validation of Array Index. CVSS score: 7.7/10. Published 2026-04-23.

How severe is CVE-2026-40886?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Argoproj Argo-workflows

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 whe…

EPSS: 0.001 (17.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

Affected products

Argoproj Argo-workflows — versions >= 4.0.0, < 4.0.5, >= 3.7.0, < 3.7.14, >= 3.6.5, <= 3.6.19
Argoproj Argo_workflows

Weakness classification (CWE)

CWE-129 — Improper Validation of Array Index

References

https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40886?: CVE-2026-40886 is a high-severity vulnerability in Argoproj Argo-workflows, classified under Improper Validation of Array Index. CVSS score: 7.7/10. Published 2026-04-23.
How severe is CVE-2026-40886?: High severity. CVSS v3 base score is 7.7 out of 10.