Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
pypa virtualenv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

virtualenv 是一个用于创建隔离的虚拟 Python 环境的工具。在 21.14.9 版本之前，app-data 复制种子程序使用 shutil.copy() 将缓存的包文件复制到后续环境中，导致缓存的源文件模式覆盖了当前运行时的 umask。因此，在过于宽松的 umask 下生成的缓存，可能会在后续可遍历的环境中产生其他本地账户可写的文件，从而允许环境所有者修改并执行诸如 pip/__init__.py 之类的包代码。攻击者无法强制设定早期的 umask，且若目标父目录为私有，则无法访问。该问题已在 21

CVSS 4.4 · Medium

Possible ATT&CK Techniques 1 AI

T1574.001 · DLL

Affected Version Matrix 1

VendorProduct Version RangeStatus
pypa virtualenv < 21.14.9 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-113720

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
virtualenv: Seeded files retain permissions from an older cache
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pypa virtualenv < 21.14.9 -

II. Public POCs for CVE-2026-113720

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-113720

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-113720 (2)

Vendor Advisories for CVE-2026-113720 (1)

Vendor Pages for CVE-2026-113720 (1)

Same Patch Batch · pypa · 2026-10-20 · 16 CVEs total

CVE-2026-113722 7.8 HIGH virtualenv: Generated POSIX console launchers interpret destination paths as shell syntax
CVE-2026-113725 7.8 HIGH virtualenv bash activate runs commands from an environment name with a backslash before $
CVE-2026-113726 7.8 HIGH virtualenv activate runs commands from the environment name in zsh with PROMPT_SUBST
CVE-2026-113776 7.8 HIGH virtualenv activation scripts run code from a path that contains a placeholder name
CVE-2026-113732 7.8 HIGH virtualenv activate.fish runs commands from a path or prompt with a backslash before a quo
CVE-2026-113718 7.1 HIGH virtualenv: Xonsh activation literals depend on the script decoding codec
CVE-2026-113723 7.1 HIGH virtualenv: Bash prompt values can change meaning under older compatibility modes
CVE-2026-113716 4.5 MEDIUM virtualenv: Builtin creation follows linked environment directories
CVE-2026-113719 4.5 MEDIUM virtualenv: Seed replacement does not contain metadata deletion paths
CVE-2026-113724 4.5 MEDIUM virtualenv: Deletion recovery can change a symlink target's mode
CVE-2026-113721 4.5 MEDIUM virtualenv: Generated files can follow existing destination links
CVE-2026-113713 4.4 MEDIUM virtualenv: Temporary app-data can leave dangling seed package links
CVE-2026-113714 2.3 LOW virtualenv: Downloaded wheel selection and caching precede verification
CVE-2026-113717 2.3 LOW virtualenv: Pip seeding with download omits wheel digest verification
CVE-2026-113715 2.0 LOW virtualenv: Venv configuration readback can reinterpret path boundaries

IV. Related Vulnerabilities

Same product: virtualenv
Same vendor: pypa
Same weakness: CWE-732

V. Comments for CVE-2026-113720

No comments yet

Leave a comment