# CVE-2026-113715: python3.13-virtualenv: virtualenv is a tool for creating isolated virtual python environments

CVE-2026-113715 is fixed in 2 products on 1 platform, first by ALAS2023-2026-3409, released November 10, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-113715
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 9, 2026

## Description

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the stdlib venv creator reads generated pyvenv.cfg with str.splitlines() and merges parsed keys over virtualenv's selected configuration. An untrusted caller who influences the destination pathname can include a line-boundary character such as U+2028 to inject keys including home and include-system-site-packages, causing path data to change configuration structure before final output. Setting include-system-site-packages to true weakens environment isolation, while an altered home can change which standard-library files the interpreter loads if the attacker also controls that location. The builtin creator does not use this readback path. This issue is fixed in version 21.14.9.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-virtualenv amzn 2023 | 20.4.0-3.amzn2023.0.6 | [ALAS2023-2026-3409](https://patchblox.com/security/data/fix/linux/alas2023-2026-3409.md) | Nov 10, 2026 |
| Linux | python3.13-virtualenv amzn 2023 | 20.21.1-1.amzn2023.0.5 | [ALAS2023-2026-3410](https://patchblox.com/security/data/fix/linux/alas2023-2026-3410.md) | Nov 10, 2026 |

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Data as of 2026-11-11T13:47:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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