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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Python
  • Cpython

No data.

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References
Link Providers
https://github.com/python/cpython/issues/151981 cve-icon
https://github.com/python/cpython/pull/151982 cve-icon
https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/ cve-icon
History

Wed, 24 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 24 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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. 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

Wed, 24 Jun 2026 13:00:00 +0000

Type Values Removed Values Added
References

Wed, 24 Jun 2026 01:15:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Tue, 23 Jun 2026 22:30:00 +0000

Type Values Removed Values Added
Description 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.
Title tarfile opened in streaming mode mishandles EOF
Weaknesses CWE-252
CWE-606
CWE-770
References
Metrics cvssV4_0

{'score': 8.2, 'vector': '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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published: 2026-06-23T22:02:45.434Z

Updated: 2026-06-24T15:34:06.959Z

Reserved: 2026-06-11T11:35:05.520Z

Link: CVE-2026-11972

cve-icon Vulnrichment

Updated: 2026-06-24T15:34:04.108Z

cve-icon NVD

No data.

cve-icon Redhat

No data.