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CVE-2026-15310— zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits

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基金会开源的一套开源的、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 3.16.0之前版本存在资源管理错误漏洞，该漏洞源于使用bzip/LZMA/Zstandard压缩解压特制的zip文件时，Python可能使用攻击者控制的大小预分配内存，可能导致内存耗尽。

CVSS 2.1 · Low EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.22 affected
3.11.0< 3.11.17 affected
3.12.0< 3.12.15 affected
3.13.0< 3.13.16 affected
3.14.0< 3.14.8 affected
3.15.0a1< 3.15.0rc2 affected
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I. Basic Information for CVE-2026-15310

Vulnerability Information
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Vulnerability Title
zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
Source: CVE Program / CVE List V5
Vulnerability Description
When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacker-controlled size to pre-allocate memory, possibly resulting in memory exhaustion.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Python 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会开源的一套开源的、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 3.16.0之前版本存在资源管理错误漏洞，该漏洞源于使用bzip/LZMA/Zstandard压缩解压特制的zip文件时，Python可能使用攻击者控制的大小预分配内存，可能导致内存耗尽。
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 ~ 3.10.22 -

II. Public POCs for CVE-2026-15310

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III. Intelligence Information for CVE-2026-15310

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Patches & Fixes for CVE-2026-15310 (11)

Vendor Advisories for CVE-2026-15310 (2)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-400

V. Comments for CVE-2026-15310

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