CVE-2021-33643: Fedoraproject Fedora

Critical severity, CVSS 9.1. EPSS: 1.8% chance of exploitation in the next 30 days.

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

Affected products

• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• Feep Libtar: before 1.2.21 (fixed in 1.2.21)
• Openatom Openeuler: version 20.03 only; version 22.03 only

Published 2022-08-10. Last modified 2026-06-23.