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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-006298 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0892-1 advisory.

    - CVE-2023-42363: use-after-free vulnerability in xasprintf function in xfuncs_printf.c (bsc#1217580).
    - CVE-2023-42364: use-after-free in the awk.c evaluate function (bsc#1217584).
    - CVE-2023-42365: use-after-free in the awk.c copyvar function (bsc#1217585).
    - CVE-2025-46394: files in a TAR archive can have their filenames hidden from a listing if terminal escape     sequences are       used when naming other files included in the archive (bsc#1241661).
    - CVE-2025-60876: request line incorrectly neutralized mat lead to header injection (bsc#1253245).
    - CVE-2026-26157: Arbitrary file overwrite and potential code execution via incomplete path sanitization     (bsc#1258163).
    - CVE-2026-26158: Arbitrary file modification and privilege escalation via unvalidated tar archive entries       (bsc#1258167).
    - CVE-2021-42380: Additional fix for use-after-realloc in awk (bsc#1192869).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0872-1 advisory.

    - CVE-2023-42363: use-after-free vulnerability in xasprintf function in xfuncs_printf.c (bsc#1217580).
    - CVE-2023-42364: use-after-free in the awk.c evaluate function (bsc#1217584).
    - CVE-2023-42365: use-after-free in the awk.c copyvar function (bsc#1217585).
    - CVE-2025-46394: files in a TAR archive can have their filenames hidden from a listing if terminal escape     sequences are       used when naming other files included in the archive (bsc#1241661).
    - CVE-2025-60876: request line incorrectly neutralized mat lead to header injection (bsc#1253245).
    - CVE-2026-26157: Arbitrary file overwrite and potential code execution via incomplete path sanitization     (bsc#1258163).
    - CVE-2026-26158: Arbitrary file modification and privilege escalation via unvalidated tar archive entries       (bsc#1258167).
    - CVE-2021-42380: Additional fix for use-after-realloc in awk (bsc#1192869).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0758-1 advisory.

    - CVE-2026-26157: Arbitrary file overwrite and potential code execution via incomplete path sanitization     (bsc#1258163).
    - CVE-2026-26158: Arbitrary file modification and privilege escalation via unvalidated tar archive entries       (bsc#1258167).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0759-1 advisory.

    - CVE-2026-26157: Arbitrary file overwrite and potential code execution via incomplete path sanitization     (bsc#1258163).
    - CVE-2026-26158: Arbitrary file modification and privilege escalation via unvalidated tar archive entries       (bsc#1258167).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-26158)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
303819	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: busybox (UTSA-2026-006298)	Nessus	Unity Linux Local Security Checks	high
302250	SUSE SLES12 Security Update : busybox (SUSE-SU-2026:0892-1)	Nessus	SuSE Local Security Checks	high
302102	SUSE SLES15 Security Update : busybox (SUSE-SU-2026:0872-1)	Nessus	SuSE Local Security Checks	high
301378	SUSE SLES15 / openSUSE 15 Security Update : busybox (SUSE-SU-2026:0758-1)	Nessus	SuSE Local Security Checks	high
300976	SUSE SLED15 / SLES15 Security Update : busybox (SUSE-SU-2026:0759-1)	Nessus	SuSE Local Security Checks	high
298799	Linux Distros Unpatched Vulnerability : CVE-2026-26158	Nessus	Misc.	high

Detections

Analytics

CVE-2026-26158

high

Tenable Plugins

high

high

high

high

high

high