CVE-2021-33646
libtar0t64: The th_read() function doesn’t free a variable t->th_buf.gnu_longname afterallocating memory, which may cause a memor...
CVE-2021-33646 is fixed in 3 products on 1 platform, first by libtar0 1.2.20-7ubuntu0.1~esm1, released August 10, 2022. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0200
80th percentile
The th_read() function doesn’t free a variable t->th_buf.gnu_longname afterallocating memory, which may cause a memory leak.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libtar · Debian 12.15 (bookworm) | 1.2.20-8+deb12u1 | DEBIAN-CVE-2021-33646 | Aug 10, 2022 |
| libtar · RHEL 8 | 0:1.2.20-17.el8 | RHSA-2023:2898 | May 16, 2023 |
| libtar · almalinux 8 | 1.2.20-17.el8 | ALSA-2023:2898 | May 16, 2023 |
| libtar · ol 8 | 0:1.2.20-17.el8 | ELSA-2023-2898 | May 24, 2023 |
| libtar · rocky 8 | 0:1.2.20-17.el8 | RLSA-2023:2898 | Dec 27, 2025 |
| libtar0 · Ubuntu 18.04.6 LTS (bionic) | 1.2.20-7ubuntu0.1~esm1 | libtar0 1.2.20-7ubuntu0.1~esm1 | Aug 10, 2022 |
| libtar0 · Ubuntu 20.04 LTS (focal) | 1.2.20-8ubuntu0.20.04.1 | libtar0 1.2.20-8ubuntu0.20.04.1 | Aug 10, 2022 |
| libtar0 · Ubuntu 22.04.1 LTS (jammy) | 1.2.20-8ubuntu0.22.04.1 | libtar0 1.2.20-8ubuntu0.22.04.1 | Aug 10, 2022 |
| libtar0t64 · Ubuntu 24.04.5 LTS (noble) | 1.2.20-8.1ubuntu0.24.04.1 | libtar0t64 1.2.20-8.1ubuntu0.24.04.1 | Aug 10, 2022 |
| libtar0t64 · Ubuntu 24.10 (oracular) | 1.2.20-8.1ubuntu0.24.10.1 | libtar0t64 1.2.20-8.1ubuntu0.24.10.1 | Jan 16, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.