CVE-2026-113951 Apple CVE debrief

Who should care

Defenders managing container environments, especially those using untrusted containers or with filesystem access, should assess exposure and prioritize verification and remediation efforts.

Why it matters

CVE-2026-113951 allows an attacker with filesystem access inside a container to potentially execute arbitrary commands on the host. Defenders should prioritize verifying exposure, especially in environments with untrusted containers, and update to Container version 1.5.0 or later. Evidence of exploitation is limited, and further verification is required.

• Potential for arbitrary command execution on the host from untrusted container filesystem access.
• Need for verification of exposure in container environments.
• Priority for updating to Container version 1.5.0 or later.
• Importance of monitoring for unusual kubectl activity.

Technical summary

CVE-2026-113951 involves planting an exec credential plugin in /etc/kubernetes/admin.conf, allowing potential arbitrary command execution on the host when running kubectl against the cluster's kubeconfig. This vulnerability is addressed in Container version 1.5.0 and affects container environments, especially those with untrusted containers or filesystem access. Defenders should prioritize verifying exposure and assess the need for compensating controls. The vulnerability allows an attacker to execute arbitrary commands on the host.

Defensive priority

Defenders should prioritize verifying exposure in container environments, especially where untrusted containers may have filesystem access, and assess the need for compensating controls.

Recommended defensive actions

• Verify container environments for exposure, especially where untrusted containers have filesystem access.
• Assess the need for compensating controls in environments using affected container versions.
• Update to Container version 1.5.0 or later where possible.
• Monitor for unusual kubectl activity or credential plugin usage.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but evidence of exploitation or affected versions beyond Container version 1.5.0 is not provided. Evidence is limited and verification is required. Defenders should verify exposure, especially in environments with untrusted containers, and update to Container version 1.5.0 or later. Limited evidence suggests potential for exploitation, but further verification is needed.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.