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.
在使用 bzip/LZMA/Zstandard 压缩格式解压构造的 ZIP 文件时，Python 可能会使用攻击者控制的尺寸来预分配内存，从而导致内存耗尽。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.16.0 |
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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.15.0 | - |
|
II. Public POCs for CVE-2026-15310
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-15310 (2)
Vendor Advisories for CVE-2026-15310 (2)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-15310
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