How severe is CVE-2025-66626?

CVE-2025-66626 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2025-66626 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66626?

CVE-2025-66626 affects Argoproj Argo Workflows. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66626?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66626 have an EU (EUVD) identifier?

Yes. CVE-2025-66626 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202177.

When was CVE-2025-66626 published?

CVE-2025-66626 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-66626

CVE-2025-66626 is a high-severity vulnerability in Argoproj Argo Workflows with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-59.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202177
Weakness: CWE-59
Affected product: Argoproj Argo Workflows
Published: 2025-12-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-66626?: 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 severe is CVE-2025-66626?: CVE-2025-66626 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2025-66626 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66626?: CVE-2025-66626 affects Argoproj Argo Workflows. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66626?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66626 have an EU (EUVD) identifier?: Yes. CVE-2025-66626 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202177.
When was CVE-2025-66626 published?: CVE-2025-66626 was published on 2025-12-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*

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