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CVE-2025-4435— Tarfile extracts filtered members when errorlevel=0

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
Public or AI PoC available; prioritize validation
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存在安全漏洞，该漏洞源于TarFile.errorlevel = 0时过滤成员未被跳过仍被提取。

CVSS 7.5 · High EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.9.23 affected
3.10.0< 3.10.18 affected
3.11.0< 3.11.13 affected
3.12.0< 3.12.11 affected
3.13.0< 3.13.4 affected
3.14.0a1< 3.14.0b3 affected
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I. Basic Information for CVE-2025-4435

Vulnerability Information
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Vulnerability Title
Tarfile extracts filtered members when errorlevel=0
Source: CVE Program / CVE List V5
Vulnerability Description
When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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存在安全漏洞，该漏洞源于TarFile.errorlevel = 0时过滤成员未被跳过仍被提取。
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 ~ 3.9.23 -

II. Public POCs for CVE-2025-4435

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8714 chars
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III. Intelligence Information for CVE-2025-4435

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Patches & Fixes for CVE-2025-4435 (5)

Same Patch Batch · Python Software Foundation · 2025-06-03 · 5 CVEs total

CVE-2025-4517 9.4 CRITICAL Arbitrary writes via tarfile realpath overflow
CVE-2025-4138 7.5 HIGH Bypassing extraction filter to create symlinks to arbitrary targets outside extraction dir
CVE-2025-4330 7.5 HIGH Extraction filter bypass for linking outside extraction directory
CVE-2024-12718 5.3 MEDIUM Bypass extraction filter to modify file metadata outside extraction directory

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2025-4435

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