CVE-2026-108119
Published: October 15, 2026Last modified: October 17, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.3 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | busybox | Vulnerable (1.35.0-r29) |
| 25 LTS | busybox | Vulnerable (1.37.0-r20) | |
| Stream | busybox | Vulnerable (1.36.1-r1) | |
| Hardened Containers | 23 LTS | busybox | Vulnerable (1.35.0-r29) |
| 25 LTS | busybox | Vulnerable (1.37.0-r20) | |
| Stream | busybox | Vulnerable (1.36.1-r1) |