CVE-2026-113724— virtualenv: Deletion recovery can change a symlink target's mode
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，其 删除错误处理程序在遇到删除失败时，会调用 读取文件的模式位，随后通过 设置所有者可写权限，而该操作会跟随符号链接。因此，如果在一个只读目录中预先植入了符号链接，且该链接指向一个由受害者拥有、但初始时调用用户不可写的目标文件（位于目标目录之外），那么在重试失败之前，该目标文件的权限可能被放宽为广泛可写（前提是调用用户拥有该目标文件并能修改其模式）。其他账户仅在其能够遍历目标文件的父目录时，才能利用这一被放宽的权
Possible ATT&CK Techniques 2 AI
T1565.002 · Transmitted Data Manipulation T1565.001 · Stored Data Manipulation
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I. Basic Information for CVE-2026-113724
Vulnerability Information
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Vulnerability Title
virtualenv: Deletion recovery can change a symlink target's mode
Source: CVE Program / CVE List V5
Vulnerability Description
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the safe_delete() deletion error handler responds to a failed removal by reading mode bits with os.lstat(path) and applying owner-write permission with os.chmod(path, ...), which follows a symlink. A planted link inside a read-only directory can therefore cause a victim-owned target outside the destination that is initially not writable by the invoking user to become broadly writable before the retry fails, provided that user owns the target and can change its mode. Another account can use the widened mode only if it can traverse the target's parent directories; root does not reach the demonstrated failure path, and the operation does not itself read the target. 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-2026-113724
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-113724 (1)
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Release 21.14.9 · pypa/virtualenv · GitHub x_refsource_MISC
Other References for CVE-2026-113724 (3)
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https://github.com/pypa/virtualenv/pull/3427 x_refsource_MISC
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https://github.com/pypa/virtualenv/security/advisories/GHSA-43mp-35q3-x3fq 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-2026-113721 | 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-2026-113720 | 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-2026-113723
virtualenv: Bash prompt values can change meaning under olde
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-2026-113723
virtualenv: Bash prompt values can change meaning under olde
Same weakness: CWE-59
-
CVE-2026-113721
virtualenv: Generated files can follow existing destination -
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-2026-113724
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