# CVE-2016-3189: Python 3.8 and 4 others: Use After Free

CVE-2016-3189 is fixed in 2 products on 1 platform, first by Python 3.10 3.10.3, released March 16, 2022. 2 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2016-3189
- Priority: Routine
- CVSS: 6.5
- EPSS: 0.1569
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 30, 2016
- Weakness: CWE-416: Use After Free
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2016-3189

## Description

Use-after-free vulnerability in bzip2recover in bzip2 1.0.6 allows remote attackers to cause a denial of service (crash) via a crafted bzip2 file, related to block ends set to before the start of the block.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.10 | 3.10.3 | [Python 3.10 3.10.3](https://patchblox.com/security/data/fix/windows-app/python.python.3.10-3.10.3.md) | Mar 16, 2022 |
| Windows apps | Python 3.9 | 3.9.13 | [Python 3.9 3.9.13](https://patchblox.com/security/data/fix/windows-app/python.python.3.9-3.9.13.md) | May 17, 2022 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Python 3.7 | no-fix |
| Windows apps | Python 3.8 | no-fix |

---

Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo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.