CVE-2025-66626: GO-2025-4223 - RCE via ZipSlip and symbolic links in argoproj/argo-workflows in github.com/argoproj/argo-workflows

CVE-2025-66626 · Severity: high · CVSS 8.1 · Published 2025-12-09

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Versions 3.6.13 and below and versions 3.7.0 through 3.7.4, contain unsafe untar code that handles symbolic links in archives. Concretely, the computation of a link's target and the subsequent check are flawed. An attacker can overwrite the file /var/run/argo/argoexec with a script of their choice, which would be executed at the pod's start. The patch deployed against CVE-2025-62156 is ineffective against malicious archives containing symbolic links. This issue is fixed in versions 3.6.14 and 3.7.5.

Technologies: github.com/argoproj/argo-workflows (Go), github.com/argoproj/argo-workflows/v2 (Go), github.com/argoproj/argo-workflows/v3 (Go). Vendors: Go.

Quick answers

Is CVE-2025-66626 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-66626 being exploited in the wild.
How severe is CVE-2025-66626?
High severity, with a CVSS score of 8.1, published 9 December 2025.
Which products and versions are affected?
github.com/argoproj/argo-workflows (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=2.5.3-rc4; github.com/argoproj/argo-workflows/v2 (Go) SEMVER:introduced=0; github.com/argoproj/argo-workflows/v3 (Go) SEMVER:introduced=0,fixed=3.6.14,introduced=3.7.0,fixed=3.7.5, SEMVER:introduced=3.7.0,fixed=3.7.5.
Is there a fix for CVE-2025-66626?
Yes. github.com/argoproj/argo-workflows/v3 (Go): upgrade to 3.7.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-66626?
Check whether you run Argoproj Argo Workflows, github.com/argoproj/argo-workflows (Go), github.com/argoproj/argo-workflows/v2 (Go) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/argoproj/argo-workflows/v3 (Go): upgrade to 3.7.5 or later
    go get github.com/argoproj/argo-workflows/v3@v3.7.5

Affected products

  • Argoproj Argo Workflows
  • github.com/argoproj/argo-workflows (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=2.5.3-rc4
  • github.com/argoproj/argo-workflows/v2 (Go) SEMVER:introduced=0
  • github.com/argoproj/argo-workflows/v3 (Go) SEMVER:introduced=0,fixed=3.6.14,introduced=3.7.0,fixed=3.7.5, SEMVER:introduced=3.7.0,fixed=3.7.5

Identifiers

  • CVE-2025-66626
  • GHSA-xrqc-7xgx-c9vh
  • GO-2025-4223

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.