CVE-2026-95838

containerd: Unpack DoS via repeated opaque whiteouts

State: Published
Severity: 4.6 Medium
Published: Oct 12, 2026
Updated: Oct 13, 2026
Reserved: Sep 22, 2026

Description

containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd's layer unpack handler repeatedly traverses directories for certain opaque whiteout configurations. A malicious image layer can trigger repeated directory traversals while opaque whiteouts are processed. Pulling or importing the image can consume CPU, delay container startup, and reduce image-pull concurrency for unrelated deployments. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5.

Scores

CVSS	Score	Vector	Source
4.0	4.6 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
containerdcontainerd	< 1.7.35Affected >= 2.0.0-beta.0, < 2.0.12Affected >= 2.2.0, < 2.2.8Affected >= 2.3.0, < 2.3.5Affected

References

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