Medium [CVE-2026-47262] Denial of Service via maliciously crafted image leading to unbounded group parsing
This medium-severity Red Hat Linux advisory covers CVE-2026-47262 affecting Red Hat Hardened Images.
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Summary
containerd is an open-source container runtime. Versions prior to 1.7.33, 2.0.10, 2.1.9, 2.2.5 and 2.3.2, contain a vulnerability that allows a maliciously crafted image to cause a Denial of Service (DoS) condition.
When creating a container from this image, memory exhaustion occurs, leading to an Out Of Memory (OOM) kill of the containerd process. This renders the container runtime API unavailable and can disrupt clients such as the Docker Engine or Kubernetes control-plane components.
This issue has been fixed in versions 1.7.33, 2.0.10, 2.1.9, 2.2.5 and 2.3.2. A remote attacker could exploit this vulnerability by providing a maliciously crafted image.
When a container is created from this image, it leads to uncontrolled resource consumption and memory exhaustion, causing the containerd process to terminate.
While containerd libraries are bundled in some images for OCI image operations (e.g., estargz support via skopeo), the containerd daemon and its CRI plugin (where the vulnerable group-parsing code path exists) are not executed. Therefore, this vulnerability is not exploitable in Red Hat products.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
Affected Red Hat products: Red Hat Hardened Images.
- < 1.7.33
- < 2.0.10
- < 2.1.9
- < 2.2.5
- < 2.3.2
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 1.7.33
- 2.0.10
- 2.1.9
- 2.2.5
- 2.3.2
- kubernetes1-35-main-1.35.6-1.hum1
- kubernetes1-36-main-1.36.2-2.hum1
- opentelemetry-collector-contrib-main-0.155.0-0.1.hum1
- grype-main-0.115.0-0.1.hum1
- syft-main-1.46.0-0.1.hum1
- trivy-main-0.72.0-0.1.hum1
- RHSA-2026:25535
- RHSA-2026:26990
- RHSA-2026:29770
- RHSA-2026:32963
- RHSA-2026:32974
- RHSA-2026:35111
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- No mitigation is needed for Red Hat products. The vulnerable code path in containerd's CRI plugin group-parsing logic is not executed because Red Hat uses CRI-O as the container runtime. Products that bundle containerd as a library dependency for OCI image operations are not affected.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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