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Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

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

Medium 4.4

In plain English

A medium-severity security flaw in virtualenv from pypa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)4.4Medium
Exploit odds (30 days)0.2%top 89.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-virtualenvno fix listedDEBIAN-CVE-2026-113713
Debian:13python-virtualenvno fix listedDEBIAN-CVE-2026-113713
Debian:14python-virtualenvno fix listedDEBIAN-CVE-2026-113713
PyPIvirtualenv21.14.10GHSA-4f8h-vr72-p32c
Ubuntu:26.04:LTSpython-virtualenvno fix listedUBUNTU-CVE-2026-113713
Ubuntu:26.10python-virtualenvno fix listedUBUNTU-CVE-2026-113713

Affected products (as reported)

VendorProductVersions
pypa virtualenv >= 21.14.8, < 21.14.10

Weakness: CWE-377 · 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

References