# ALSA-2023:2898: libtar security update

ALSA-2023:2898, released May 16, 2023, fixes 4 CVEs in libtar (version 1.2.20-17.el8). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/alsa-2023-2898
- Platform: Linux
- Released: May 16, 2023
- Priority: High (Closes CVE-2021-33645, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/ALSA-2023:2898

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libtar](https://patchblox.com/security/data/product/linux/libtar.md) | almalinux 8 | 1.2.20-17.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-33645](https://patchblox.com/security/data/cve/CVE-2021-33645.md) | High | libtar0t64: The th_read() function doesn’t free a variable t->th_buf.gnu_longlink afterallocating memory, which may cause a memor... | 7.5 | 0.0202 |  |
| [CVE-2021-33646](https://patchblox.com/security/data/cve/CVE-2021-33646.md) | High | libtar0t64: The th_read() function doesn’t free a variable t->th_buf.gnu_longname afterallocating memory, which may cause a memor... | 7.5 | 0.0200 |  |
| [CVE-2021-33643](https://patchblox.com/security/data/cve/CVE-2021-33643.md) | High | libtar0t64: An attacker who submits a crafted tar file with size in header struct being0 may be able to trigger an calling of mal... | 9.1 | 0.0188 |  |
| [CVE-2021-33644](https://patchblox.com/security/data/cve/CVE-2021-33644.md) | High | libtar0t64: An attacker who submits a crafted tar file with size in header struct being0 may be able to trigger an calling of mal... | 8.1 | 0.0158 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo