PT-2026-51603 · Python · Cpython

Petr Viktorin + 2 · Published 2026-06-23 · Updated 2026-06-23 · CVE-2026-11972

NVD

CVSS v4.0

8.2

High

Base vector

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

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, meaning an archive could be parsed in an infinite loop.

Fix

Unchecked Return Value

Allocation of Resources Without Limits

Weakness Enumeration

CWE-252

CWE-606

CWE-770

Related Identifiers

CVE-2026-11972

Affected Products

Cpython

References · 4

• https://github.com/python/cpython/pull/151982 · Patch
• https://mail.python.org/archives/list/[e-mail]/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-11972 · Security Note
• https://github.com/python/cpython/issues/151981 · Note