CVE-2026-113721— virtualenv: Generated files can follow existing destination links
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 Python 虚拟环境的工具。在 21.14.9 版本之前，ViaTemplateActivator._generate() 方法仅在 Path.exists() 返回 true 时才会删除已存在的输出文件，这会导致残留的符号链接（dangling symlink）未被清理，从而将生成的激活脚本内容重定向到非预期位置。同时，PyEnvCfg.write() 方法在写入 pyvenv.cfg 文件时，会先打开文件，而未先替换可能存在的符号链接或硬链接。因此，另一个本地账户若
Possible ATT&CK Techniques 1 AI
T1565.003 · Runtime Data Manipulation
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I. Basic Information for CVE-2026-113721
Vulnerability Information
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Vulnerability Title
virtualenv: Generated files can follow existing destination links
Source: CVE Program / CVE List V5
Vulnerability Description
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, ViaTemplateActivator._generate() removes an existing output only when Path.exists() is true, allowing a dangling symlink to survive and redirect generated activation content, while PyEnvCfg.write() opens pyvenv.cfg without first replacing an existing symbolic or hard link. Another local account that prepares final entries inside the destination can therefore cause environment creation to create or overwrite files outside the requested tree with constrained virtualenv-generated content and the invoking user's permissions. The destination parent must remain controlled by the environment owner during creation; concurrent parent-directory replacement is a separate concern. This issue is fixed in version 21.14.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| pypa | virtualenv | < 21.14.9 | - |
|
II. Public POCs for CVE-2026-113721
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-113721 (4)
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https://github.com/pypa/virtualenv/pull/3431 x_refsource_MISC
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https://github.com/pypa/virtualenv/releases/tag/21.14.9 x_refsource_MISC
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https://github.com/pypa/virtualenv/security/advisories/GHSA-558c-9hv2-4prj x_refsource_CONFIRM
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-2026-113713 | 4.4 MEDIUM | virtualenv: Temporary app-data can leave dangling seed package links |
| CVE-2026-113720 | 4.4 MEDIUM | virtualenv: Seeded files retain permissions from an older cache |
| 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
-
CVE-2026-113726
virtualenv activate runs commands from the environment name -
CVE-2026-113776
virtualenv activation scripts run code from a path that cont -
CVE-2026-113732
virtualenv activate.fish runs commands from a path or prompt -
CVE-2026-113725
virtualenv bash activate runs commands from an environment n -
CVE-2026-113724
virtualenv: Deletion recovery can change a symlink target's
Same vendor: pypa
-
CVE-2026-113726
virtualenv activate runs commands from the environment name -
CVE-2026-113776
virtualenv activation scripts run code from a path that cont -
CVE-2026-113732
virtualenv activate.fish runs commands from a path or prompt -
CVE-2026-113725
virtualenv bash activate runs commands from an environment n -
CVE-2026-113724
virtualenv: Deletion recovery can change a symlink target's
Same weakness: CWE-59
-
CVE-2026-113724
virtualenv: Deletion recovery can change a symlink target's -
CVE-2026-113716
virtualenv: Builtin creation follows linked environment dire -
CVE-2026-113678
Froxlor before 2.3.15 Symlink Following Privilege Escalation -
CVE-2026-112936
filelock: ReadWriteLock follows a symlink at the lock path i -
CVE-2026-112912
filelock: Symlink swap during SoftFileLock's writability che
V. Comments for CVE-2026-113721
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