CVE-2026-12003— Python Software Foundation CPython 权限许可和访问控制问题漏洞
一分钟漏洞结论
影响对象
Python Software Foundation CPython
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Python Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python Software Foundation CPython 3.15.0之前版本存在权限许可和访问控制问题漏洞，该漏洞源于在Windows平台上VPATH变量设置为'..\\..'导致地标路径'..\\..\\Modules\\setup.local'位于安装目录之外，可能允许低权限用户创建地标及替代Lib文件夹，导致在限制性安装中发现该路径，造成权
影响版本矩阵 5
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.11.16 |
affected |
3.12.0< 3.12.14 |
affected | ||
3.13.0< 3.13.15 |
affected | ||
3.14.0< 3.14.7 |
affected | ||
3.15.0a1< 3.15.0b3 |
affected |
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一、 漏洞 CVE-2026-12003 基础信息
漏洞信息
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Vulnerability Title
CPython >3.11 Insecure Input Validation resulting in privilege escalation
来源: CVE Program / CVE List V5
Vulnerability Description
To allow builds of Python to be run from an in-tree layout (rather than
an installed file layout), the VPATH variable is defined at build time
and used to locate certain landmarks - specifically,
Modules/setup.local. When this landmark is found relative to VPATH
relative to the executable, Python assumes it is running in a source
tree and generates a different default sys.path. This code remains in
release builds, so that release-ready builds can be built in-tree.
On Windows, since builds are written to 'PCbuild/', the value of
VPATH is set to '..\..', which results in a landmark of
'..\..\Modules\setup.local'. This path is outside the install directory
of Python, and may have different permissions, potentially allowing a
low-privilege user to create the landmark and an alternative `Lib`
folder that will be discovered by an otherwise restricted install.
Such a setup occurs with the legacy default install location for all
users (in the now superseded EXE installer), due to how Windows allows
all users to create folders in the root directory of their OS drive.
Our recommended mitigation on Windows is to migrate away from the
legacy installer and use the new [Python install
manager](https://www.python.org/downloads/latest/pymanager/) to install
for the current user. Installs where the directory two levels above the
Python installation directory have equivalent permissions are unaffected
(in general, a per-user install cannot be modified at all by other
users, removing any escalation of privilege risk, and could be directly
modified by a privileged user, making the potential tampering
irrelevant). Alternative mitigations might include preemptively creating
and restricting access to a `Modules` directory. Be aware that only 3.13
and 3.14 will receive updated legacy installers - earlier fixes are only
provided as sources.
Platforms other than Windows allow VPATH to be overridden, but as they
don't usually use a separated directory in the build for binaries, are
unlikely to have a landmark reference outside of the install directory.
The landmark detection involving VPATH is a fallback for when a more
specific landmark - .\pybuilddir.txt - is absent, and was included for
compatibility. Future releases of Python will no longer include the
fallback, and so builds will need to generate or preserve the
pybuilddir.txt file in order to work in-tree. This landmark file has
been generated on Windows since 3.11, and on other platforms for longer.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
来源: CVE Program / CVE List V5
Vulnerability Title
Python Software Foundation CPython 权限许可和访问控制问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Python Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python Software Foundation CPython 3.15.0之前版本存在权限许可和访问控制问题漏洞，该漏洞源于在Windows平台上VPATH变量设置为'..\\..'导致地标路径'..\\..\\Modules\\setup.local'位于安装目录之外，可能允许低权限用户创建地标及替代Lib文件夹，导致在限制性安装中发现该路径，造成权
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.11.16 | - |
|
二、漏洞 CVE-2026-12003 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-12003 补丁与修复 (8)
CVE-2026-12003 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-12003
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