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High, CVSS 7.7

Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows Controller

CVE-2026-40886GHSA-5jv8-h7qh-rf5p

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS
  • CVE-2026-40886: 0.38% estimated exploitation activity in the next 30 days; percentile 31.77 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary 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. Details podGCFromPod() splits the annotation value on "/" and unconditionally accesses parts[1]: If the annotation value contains no "/", parts has length 1 and parts[1] panics with index out of range. The code was introduced in #14129 and affects versions: - 3.6.x: v3.6.5 through v3.6.19 (backport in #14263) - 3.7.x: v3.7.0-rc1 through v3.7.12 - 4.x: v4.0.0-rc1 through v4.0.3 - Not affected: v3.6.4 and earlier PoC Apply this workflow to a cluster running the Argo Workflows controller: Within seconds the controller…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5jv8-h7qh-rf5p

Agent brief

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# Patch Next advisory brief: CVE-2026-40886

Advisory: Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows Controller
IDs: CVE-2026-40886, GHSA-5jv8-h7qh-rf5p
Record: https://patchnext.com/advisories/cve-2026-40886 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/argoproj/argo-workflows/v4 4.0.5; github.com/argoproj/argo-workflows/v3 3.7.14. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/argoproj/argo-workflows/v4: affected >= 4.0.0, < 4.0.5; fixed in 4.0.5
- Go github.com/argoproj/argo-workflows/v3: affected >= 3.7.0, < 3.7.14; >= 3.6.5, <= 3.6.19; fixed in 3.7.14

## Suggested inspection (read-only)
- Go github.com/argoproj/argo-workflows/v4: check the installed version with your package manager.
- Go github.com/argoproj/argo-workflows/v3: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/argoproj/argo-workflows/v4, github.com/argoproj/argo-workflows/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5jv8-h7qh-rf5p (GitHub-reviewed advisory GHSA-5jv8-h7qh-rf5p lists affected ranges: Go github.com/argoproj/argo-workflows/v4 >=4.0.0 =3.7.0 =3.6.5 <=3.6.19)

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