7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21641-1 advisory.

    This update for 7zip fixes the following issue:

    Update to 26.02.

    - CVE-2026-14266: heap buffer overflow when processing XZ chunked data can lead to remote code execution     (bsc#1273065).

Tenable has extracted the preceding description block directly from the SUSE 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 Debian 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4718 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4718-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Sylvain Beucler     August 05, 2026                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : 7zip     Version        : 22.01+really26.02+dfsg-0+deb12u1     CVE ID         : CVE-2026-14266 CVE-2026-58052     Debian Bug     : 1142293

    Multiple vulnerabilities were discovered in 7-Zip, a file archiver     handling multiple formats.

    Among the fixed vulnerabilities, the following were made public:

    CVE-2026-14266

        XZ decompression heap-based buffer overflow, potentially leading         to remote code execution.

    CVE-2026-58052

        RAR5 alternate-stream handling issue, when running on an NTFS         filesystem with transparent ADS (Alternate Data Stream) and ADS         canonicalization, letting an attacker defeat Mark-of-the-Web         warnings and spoof file content.

    For Debian 12 bookworm, these problems have been fixed in version     22.01+really26.02+dfsg-0+deb12u1.

    We recommend that you upgrade your 7zip packages.

    For the detailed security status of 7zip please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/7zip

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4719 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4719-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Sylvain Beucler     August 05, 2026                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : p7zip     Version        : 16.02+really26.02+dfsg-0+deb11u1                      16.02+really26.02+dfsg-0+deb12u1     CVE ID         : CVE-2026-14266 CVE-2026-58052     Debian Bug     : 1142293

    Multiple vulnerabilities were discovered in p7zip, a now unmaintained     fork of 7-Zip, which itself is a file archiver handling multiple     formats.

    To address these security vulnerabilities, whose fixes unfortunately     cannot be isolated, this update again replaces p7zip with a recent     7-Zip (now v26.02), slightly modified to make it reasonably compatible     with p7zip.

    Among the fixed vulnerabilities, the following were made public:

    CVE-2026-14266

        XZ decompression heap-based buffer overflow, potentially leading         to remote code execution.

    CVE-2026-58052

        RAR5 alternate-stream handling issue, when running on an NTFS         filesystem with transparent ADS (Alternate Data Stream) and ADS         canonicalization, letting an attacker defeat Mark-of-the-Web         warnings and spoof file content.

    For Debian 11 bullseye, these problems have been fixed in version     16.02+really26.02+dfsg-0+deb11u1.

    For Debian 12 bookworm, these problems have been fixed in version     16.02+really26.02+dfsg-0+deb12u1.

    We recommend that you upgrade your p7zip packages.

    For the detailed security status of p7zip please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/p7zip

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

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

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-2037 advisory.

    NOTE: Since p7zip/16.02+transitional.1 src:p7zip is only an empty source packageNOTE: depending on 7zip.
    Mark this version as fixed version.NOTE:
    https://www.zerodayinitiative.com/advisories/ZDI-26-444/DEBIANBUG: [1142293] (CVE-2026-14266)

Tenable has extracted the preceding description block directly from the tested product 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability     allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is     required to exploit this vulnerability in that the target must visit a malicious page or open a malicious     file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can     trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in     the context of the current process. Was ZDI-CAN-30169. (CVE-2026-14266)

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

ID	Name	Product	Family	Type	Severity
341172	openSUSE 16 Security Update : 7zip (openSUSE-SU-2026:21641-1)	Nessus	SuSE Local Security Checks	Local	high
332781	Debian dla-4718 : 7zip - security update	Nessus	Debian Local Security Checks	Local	medium
332780	Debian dla-4719 : p7zip - security update	Nessus	Debian Local Security Checks	Local	medium
332025	Amazon Linux 2023 : 7zip, 7zip-reduced, 7zip-standalone (ALAS2023-2026-2037)	Nessus	Amazon Linux Local Security Checks	Local	high
327694	Linux Distros Unpatched Vulnerability : CVE-2026-14266	Nessus	Misc.	Local	high

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