# CVE-2021-20193: tar: A flaw was found in the src/list.c of tar 1.33 and earlier

CVE-2021-20193 is fixed in 2 products on 1 platform, first by tar 1.29b-2ubuntu0.3, released March 26, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-20193
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0110
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 26, 2021

## Description

A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tar Ubuntu 18.04.6 LTS (bionic) | 1.29b-2ubuntu0.3 | [tar 1.29b-2ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tar-1.29b-2ubuntu0.3.md) | Mar 26, 2021 |
| Linux | tar Ubuntu 20.04 LTS (focal) | 1.30+dfsg-7ubuntu0.20.04.2 | [tar 1.30+dfsg-7ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tar-1.30-dfsg-7ubuntu0.20.04.2.md) | Mar 26, 2021 |
| Linux | tar Ubuntu 22.04.1 LTS (jammy) | 1.34+dfsg-1build1 | [tar 1.34+dfsg-1build1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-tar-1.34-dfsg-1build1.md) | Mar 26, 2021 |
| Linux | tar-scripts Ubuntu 18.04.6 LTS (bionic) | 1.29b-2ubuntu0.3 | [tar-scripts 1.29b-2ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tar-scripts-1.29b-2ubuntu0.3.md) | Mar 26, 2021 |
| Linux | tar-scripts Ubuntu 20.04 LTS (focal) | 1.30+dfsg-7ubuntu0.20.04.2 | [tar-scripts 1.30+dfsg-7ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tar-scripts-1.30-dfsg-7ubuntu0.20.04.2.md) | Mar 26, 2021 |
| Linux | tar-scripts Ubuntu 22.04.1 LTS (jammy) | 1.34+dfsg-1build1 | [tar-scripts 1.34+dfsg-1build1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-tar-scripts-1.34-dfsg-1build1.md) | Mar 26, 2021 |

---

Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

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.