Bug 2549893 (CVE-2026-95838)

Summary: CVE-2026-95838 github.com/containerd/containerd: containerd: Denial of Service via repeated directory traversals during layer unpacking
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in containerd. When unpacking image layers with specific file configurations such as opaque whiteout markers, the unpack handler performs repeated directory traversals. An attacker can exploit this by providing a maliciously crafted container image, leading to a Denial of Service (DoS) through excessive CPU consumption, prolonged image extraction times, and delays to unrelated container deployments.
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Description OSIDB Bzimport 2026-10-12 20:02:07 UTC 
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.