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CVE-2025-8291— ZIP64 End of Central Directory (EOCD) Locator record offset not checked

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.

Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在安全漏洞，该漏洞源于未验证ZIP64 EOCD定位器记录偏移值有效性，可能导致ZIP档案处理不一致。

CVSS 4.3 · Medium EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.9.24 affected
3.10.0< 3.10.19 affected
3.11.0< 3.11.14 affected
3.12.0< 3.12.12 affected
3.13.0< 3.13.10 affected
3.14.0< 3.14.1 affected
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I. Basic Information for CVE-2025-8291

Vulnerability Information
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Vulnerability Title
ZIP64 End of Central Directory (EOCD) Locator record offset not checked
Source: CVE Program / CVE List V5
Vulnerability Description
The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the 'zipfile' module compared to other ZIP implementations. Remediation maintains this behavior, but checks that the offset specified in the ZIP64 EOCD Locator record matches the expected value.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在安全漏洞，该漏洞源于未验证ZIP64 EOCD定位器记录偏移值有效性，可能导致ZIP档案处理不一致。
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 ~ 3.9.24 -

II. Public POCs for CVE-2025-8291

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III. Intelligence Information for CVE-2025-8291

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Patches & Fixes for CVE-2025-8291 (4)

Mailing List Discussions for CVE-2025-8291 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2025-8291

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