7.0 High

CVE-2026-26158 Busybox: busybox: arbitrary file modification and privilege escalation via unvalidated tar archive entries

Description

A flaw was found in BusyBox. This vulnerability allows an attacker to modify files outside of the intended extraction directory by crafting a malicious tar archive containing unvalidated hardlink or symlink entries. If the tar archive is extracted with elevated privileges, this flaw can lead to privilege escalation, enabling an attacker to gain unauthorized access to critical system files.

CVSS 3.1 detail

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitable with local access to the machine, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Local
Attack complexity: High
Privileges required: None
Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 6	Versions not published
Red Hat Hardened Images 1	Versions not published
Red Hat Hardened Images 1.37	earliest → < 1.37.0-7.2.hum1	1.37.0-7.2.hum1
RUGGEDCOM RST2428P 4.0	earliest → < 4.0	4.0

References

RHSA-2026:13831 access.redhat.com
access.redhat.com access.redhat.com
RHBZ#2439040 bugzilla.redhat.com
git.busybox.net git.busybox.net

Timeline

Published February 11, 2026
Last modified November 4, 2026

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