How severe is CVE-2026-42297?

CVE-2026-42297 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2026-42297 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42297?

CVE-2026-42297 affects Argoproj Argo Workflows. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42297?

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-2026-42297 have an EU (EUVD) identifier?

Yes. CVE-2026-42297 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28895.

When was CVE-2026-42297 published?

CVE-2026-42297 was published on 2026-05-09 and last updated on 2026-06-30.

CVE-2026-42297

CVE-2026-42297 is a high-severity vulnerability in Argoproj Argo Workflows with a CVSS 3.x base score of 8.3. 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-862.

Key facts

Severity: High (CVSS 3.x base score 8.3)
CVSS v4: 8.5
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28895
Weakness: CWE-862
Affected product: Argoproj Argo Workflows
Published: 2026-05-09
Last modified: 2026-06-30

Description

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, the Sync Service's ConfigMap-backed provider (server/sync/sync_cm.go) performs zero authorization checks on all CRUD operations (create, read, update, delete). Any authenticated user — including those using fake Bearer tokens — can create, read, update, and delete Kubernetes ConfigMaps containing synchronization limits. This issue has been patched in version 4.0.5.

Frequently asked questions

What is CVE-2026-42297?: Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, the Sync Service's ConfigMap-backed provider (server/sync/sync_cm.go) performs zero authorization checks on all CRUD operations (create, read, update, delete). Any authenticated user — including those using fake Bearer tokens — can create, read, update, and delete Kubernetes ConfigMaps containing synchronization limits. This issue has been patched in version 4.0.5.
How severe is CVE-2026-42297?: CVE-2026-42297 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2026-42297 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42297?: CVE-2026-42297 affects Argoproj Argo Workflows. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42297?: 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-2026-42297 have an EU (EUVD) identifier?: Yes. CVE-2026-42297 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28895.
When was CVE-2026-42297 published?: CVE-2026-42297 was published on 2026-05-09 and last updated on 2026-06-30.

References

Affected products (1)

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

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