CVE-2025-6075— Quadratic complexity in os.path.expandvars() with user-controlled template
Quick assessment
Affected
Python Software Foundation CPython
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.
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython 3.15.0之前版本存在安全漏洞，该漏洞源于用户可控值传递给os.path.expandvars时可能导致环境变量扩展性能下降。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.9.25 |
affected |
3.10.0< 3.10.20 |
affected | ||
3.11.0< 3.11.15 |
affected | ||
3.12.0< 3.12.13 |
affected | ||
3.13.0< 3.13.10 |
affected | ||
3.14.0< 3.14.1 |
affected | ||
3.15.0a1< 3.15.0a2 |
affected |
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I. Basic Information for CVE-2025-6075
Vulnerability Information
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Vulnerability Title
Quadratic complexity in os.path.expandvars() with user-controlled template
Source: CVE Program / CVE List V5
Vulnerability Description
If the value passed to os.path.expandvars() is user-controlled a
performance degradation is possible when expanding environment
variables.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
CPython 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython 3.15.0之前版本存在安全漏洞，该漏洞源于用户可控值传递给os.path.expandvars时可能导致环境变量扩展性能下降。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.9.25 | - |
|
II. Public POCs for CVE-2025-6075
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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V. Comments for CVE-2025-6075
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