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CVE-2026-56859VulnerabilityPublished

Kubernetes: Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack

Affects kubernetesSource GCVE Database

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Authoritative record:CVE-2026-56859· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade to 1.34.13-r2 soon.

Data as of 11 Nov 2026, 04:03 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.34.13-r2, 4.1.6-r1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Aug 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 10 Nov 2026.

What to do

Upgrade kubernetes to 1.34.13-r2; argo-workflows to 4.1.6-r1.

Affected software

ProductAffectedFixed in
CleanStartkubernetespkg:apk/cleanstart/kubernetesOther threatsAffected
  • <1.34.13-r2
Fixed in
  • 1.34.13-r2
CleanStartargo-workflowspkg:apk/cleanstart/argo-workflowsOther threatsAffected
  • <4.1.6-r1
Fixed in
  • 4.1.6-r1

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

AI-suggested

A patch is available and should be applied by upgrading to Kubernetes versions 1.34.13-r2 or 4.1.6-r1 or later. No additional mitigations are indicated by the vendor advisory.

Description

CVE-2026-56859 is a high-severity vulnerability in Kubernetes where the DecodeElement function previously reset the depth counter incorrectly, preventing it from firing as intended. This flaw could lead to stack exhaustion, potentially causing denial of service. Fixed versions 1.34.13-r2 and 4.1.6-r1 address this issue.

References

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