A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly '..' combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.
History

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 12 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
References

Sun, 11 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Busybox
Busybox busybox
Redhat hardened Images
Vendors & Products Busybox
Busybox busybox
Redhat hardened Images

Sat, 10 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 09 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly '..' combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.
Title Busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses cve-2026-26158 fix
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-59
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:6
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-09T16:45:59.735Z

Updated: 2026-10-13T16:59:20.957Z

Reserved: 2026-10-09T14:09:13.658Z

Link: CVE-2026-108119

cve-icon Vulnrichment

Updated: 2026-10-13T16:59:15.646Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-09T17:16:46.400

Modified: 2026-10-13T17:17:19.397

Link: CVE-2026-108119

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-09T15:31:42Z

Links: CVE-2026-108119 - Bugzilla