CVE-2026-26158
Published: February 15, 2026Last modified: February 18, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | busybox | Unknown (1.35.0-r29) |
| 25 LTS | busybox | Unknown (1.37.0-r20) | |
| Stream | busybox | Unknown (1.36.1-r1) | |
| Hardened Containers | 23 LTS | busybox | Unknown (1.35.0-r29) |
| 25 LTS | busybox | Unknown (1.37.0-r20) | |
| Stream | busybox | Unknown (1.36.1-r1) |
References
- https://access.redhat.com/errata/RHSA-2026:13831
- https://access.redhat.com/security/cve/CVE-2026-26158
- https://bugzilla.redhat.com/show_bug.cgi?id=2439040
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
- https://git.busybox.net/busybox/commit/archival?id=3fb6b31c716669e12f75a2accd31bb7685b1a1cb
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26158.json