CVE-2025-66626

Description

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.

How to fix CVE-2025-66626

To remediate CVE-2025-66626, upgrade the affected package to a fixed version below.

• —upgrade to 2.5.3 or later
• —no fix listed
• —no fix listed
• —no fix listed
• —upgrade to 3.7.5 or later
• —upgrade to 3.6.14 or later

Is CVE-2025-66626 being exploited?

Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.

Affected packages (6)

• from 0, < 2.5.3, >= 3.0.0, < 3.6.14
• from 0, <= 2.5.3-rc4
• from 0
• from 0
• >= 3.7.0, < 3.7.5
• from 0, < 3.6.14, >= 3.7.0, < 3.7.5

CVSS scores

References (6)

• ADVISORYgithub.com/advisories/GHSA-p84v-gxvw-73pf
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-66626
• PATCHgithub.com/argoproj/argo-workflows
• WEBgithub.com/argoproj/argo-workflows/blob/5291e0b01f94ba864f96f795bb500f2cfc5ad799/workflow/executor/executor.go#L1034-L1037