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Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

CVE-2026-113720virtualenv: Seeded files retain permissions from an older cache

Medium 4.4

In plain English

A medium-severity incorrect permission assignment in virtualenv from pypa. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)4.4Medium
Exploit odds (30 days)0.1%top 97.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run's umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-virtualenvno fix listedDEBIAN-CVE-2026-113720
Debian:13python-virtualenvno fix listedDEBIAN-CVE-2026-113720
Debian:14python-virtualenvno fix listedDEBIAN-CVE-2026-113720
PyPIvirtualenv21.14.9GHSA-fc2g-4w5p-6whm
Ubuntu:26.04:LTSpython-virtualenvno fix listedUBUNTU-CVE-2026-113720
Ubuntu:26.10python-virtualenvno fix listedUBUNTU-CVE-2026-113720

Affected products (as reported)

VendorProductVersions
pypa virtualenv < 21.14.9

Weakness: CWE-732 · 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