# 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 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo