CVE-2026-11972

HIGH

Python Software Foundation CPython - Tarfile Opened in Streaming Mode Mishandles EOF

Title source: rule
STIX 2.1

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.

References (9)

Core 9
Core References
Issue Tracking issue-tracking
https://github.com/python/cpython/issues/151981

Scores

CVSS v4 8.2
EPSS 0.0043
EPSS Percentile 35.6%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-252 CWE-606 CWE-770
Status published
Products (3)
Python Software Foundation/CPython < 3.15.0
Python Software Foundation/CPython < 3.15.0b4
Python Software Foundation/CPython < 3.16.0
Published Jun 23, 2026
Tracked Since Jun 24, 2026