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CVE-2026-11972— tarfile opened in streaming mode mishandles EOF

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.

Python Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python存在安全漏洞，该漏洞源于tarfile模块在使用流模式打开文件时未正确处理EOF，可能导致无限循环解析存档。

CVSS 8.2 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.21 affected
3.11.0< 3.11.16 affected
3.12.0< 3.12.14 affected
3.13.0< 3.13.15 affected
3.14.0< 3.14.7 affected
3.15.0a1< 3.15.0b4 affected
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I. Basic Information for CVE-2026-11972

Vulnerability Information
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Vulnerability Title
tarfile opened in streaming mode mishandles EOF
Source: CVE Program / CVE List V5
Vulnerability Description
When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
Python 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python Software Foundation CPython是Python Software Foundation基金会的编程语言解释器。 Python存在安全漏洞，该漏洞源于tarfile模块在使用流模式打开文件时未正确处理EOF，可能导致无限循环解析存档。
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 ~ 3.10.21 -

II. Public POCs for CVE-2026-11972

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7199 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-11972

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Patches & Fixes for CVE-2026-11972 (8)

Vendor Advisories for CVE-2026-11972 (1)

Other References for CVE-2026-11972 (1)

Same Patch Batch · Python Software Foundation · 2026-06-23 · 3 CVEs total

CVE-2026-11940 7.8 HIGH tarfile extraction filter bypass allows escaping the destination directory
CVE-2026-0864 4.1 MEDIUM Configuration Injection via Carriage Return (\r) in write() method

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-252

V. Comments for CVE-2026-11972

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