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Vulnerability record · CVE-2026-26158 · published 11 February 2026

CVE-2026-26158: A flaw was found in BusyBox.

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.

7.0 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-73 · CWE-73 Deferred
7.0CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
15 Jul 2026Last modified by NVD

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

References

LinkTags
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://git.busybox.net/busybox/commit/archival?id=3fb6b31c716669e12f75a2accd31bb7685b1a1cb
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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26158.json

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Source: NIST National Vulnerability Database (record CVE-2026-26158), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.