CVE-2021-20291: Fedoraproject Fedora

Medium severity, CVSS 6.5. EPSS: 1.6% chance of exploitation in the next 30 days.

A deadlock vulnerability was found in 'github.com/containers/storage' in versions before 1.28.1. When a container image is processed, each layer is unpacked using `tar`. If one of those layers is not a valid `tar` archive this causes an error leading to an unexpected situation where the code indefinitely waits for the tar unpacked stream, which never finishes. An attacker could use this vulnerability to craft a malicious image, which when downloaded and stored by an application using containers/storage, would then cause a deadlock leading to a Denial of Service (DoS).

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• Red Hat Enterprise Linux: version 8.0 only
• Red Hat Openshift Container Platform: version 4.0 only
• Storage Project Storage: before 1.28.1 (fixed in 1.28.1)

Published 2021-04-01. Last modified 2026-06-17.