CVE-2026-11972

Public on 2026-06-23

Modified on 2026-07-01

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.

Severity

Important

See what this means

CVSS v3 Base Score

7.5

See breakdown

Affected Packages

Platform	Package	Release Date	Advisory	Status
Amazon Linux 2 - Core	python	2026-07-20	ALAS2-2026-3810	Fixed
Amazon Linux 2 - Core	python3	2026-07-20	ALAS2-2026-3826	Fixed
Amazon Linux 2023	python3.11	2026-07-20	ALAS2023-2026-1953	Fixed
Amazon Linux 2023	python3.12	2026-07-20	ALAS2023-2026-1954	Fixed
Amazon Linux 2023	python3.13	2026-07-20	ALAS2023-2026-1964	Fixed
Amazon Linux 2023	python3.14	2026-07-20	ALAS2023-2026-1962	Fixed
Amazon Linux 2023	python3.9	2026-07-20	ALAS2023-2026-1963	Fixed

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-11972 Mitre: CVE-2026-11972