# CVE-2026-113722: python3.13-virtualenv: virtualenv is a tool for creating isolated virtual python environments

CVE-2026-113722 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-2026-113722
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0029
- 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, virtualenv's ScriptMakerCustom and pip pass an incompletely quoted interpreter path to distlib ScriptMaker when generating POSIX console scripts. When the path contains a space or produces a shebang longer than 127 bytes, distlib emits a /bin/sh wrapper whose double-quoted interpreter path still expands command substitutions and backticks. An attacker who influences the environment destination can therefore execute commands with the user's privileges when the user later runs a generated launcher; environment creation and activation do not trigger the command. Existing launchers are not repaired by upgrading virtualenv alone and must be regenerated, while a later independent pip installation or upgrade can reintroduce an affected launcher because pip's vendored distlib is unchanged. The virtualenv fix is released 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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