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VulnerabilityPublished Updated

CVE-2026-42183: argoproj argo-workflows · NULL Pointer Dereference

Affects argoproj argo-workflowsSource CVE Database V5

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Not known to be exploited · CVSS 2.3 Low : upgrade to 4.0.5 when convenient.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 4.0 base score
2.3Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.0.5
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.

What to do

Upgrade argo-workflows and argoproj/argo-workflows to 4.0.5.

Affected software

ProductAffectedFixed in
argoprojargo-workflowsAffected
  • >=4.0.0 <4.0.5
Fixed in
  • 4.0.5
GitHubargoproj/argo-workflowspkg:github/argoproj/argo-workflowsOther threatsAffected
  • <4.0.5 >=4.0.0
Fixed in
  • 4.0.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Argo Workflows to version 4.0.5 or later, where this vulnerability has been patched. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory stating the fix is included in version 4.0.5.

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, a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() causes a panic (denial of service) for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule, when SSO_DELEGATE_RBAC_TO_NAMESPACE=true. This issue has been patched in version 4.0.5.

References

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