py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows symbolic links to be recreated outside the destination directory via crafted malicious symbolic link chains. When using extractall to extract an archive, the library restores these symbolic links, linking them to arbitrary directories on the host file system. During extraction, the program only checks the link arcname within the destination directory, but ignores the combined symlink path resolution. Attackers can exploit this vulnerability by constructing malicious archives, thereby bypassing the directory boundary restrictions implemented by the extractor. Subsequent extraction of regular files through these symbolic links can result in arbitrary file writes. This vulnerability may lead to remote code execution, privilege escalation, data corruption, or denial of service. This issue has been fixed in version 1.1.3.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21159-1 advisory.

    Changes in python-py7zr:

    - CVE-2026-23879: crafted malicious symbolic link chains in an archive can       lead to an arbitrary file write (bsc#1268669)
    - CVE-2026-55195: unchecked extraction size can cause a denial of service (bsc#1268665)
    - CVE-2026-55206: crafted .7z archive with a large numstreams value can       cause a denial of service (bsc#1268666)

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.

  - py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption     and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows     symbolic links to be recreated outside the destination directory via crafted malicious symbolic link     chains. When using extractall to extract an archive, the library restores these symbolic links, linking     them to arbitrary directories on the host file system. During extraction, the program only checks the link     arcname within the destination directory, but ignores the combined symlink path resolution. Attackers can     exploit this vulnerability by constructing malicious archives, thereby bypassing the directory boundary     restrictions implemented by the extractor. Subsequent extraction of regular files through these symbolic     links can result in arbitrary file writes. This vulnerability may lead to remote code execution, privilege     escalation, data corruption, or denial of service. This issue has been fixed in version 1.1.3.
    (CVE-2026-23879)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption
    and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows
    symbolic links to be recreated outside the destination directory via crafted malicious symbolic link
    chains. When using extractall to extract an archive, the library restores these symbolic links, linking
    them to arbitrary directories on the host file system. During extraction, the program only checks the link
    arcname within the destination directory, but ignores the combined symlink path resolution. Attackers can
    exploit this vulnerability by constructing malicious archives, thereby bypassing the directory boundary
    restrictions implemented by the extractor. Subsequent extraction of regular files through these symbolic
    links can result in arbitrary file writes. This vulnerability may lead to remote code execution, privilege
    escalation, data corruption, or denial of service. This issue has been fixed in version 1.1.3.
    (CVE-2026-23879)

ID	Name	Product	Family	Severity
324069	openSUSE 16 Security Update : python-py7zr (openSUSE-SU-2026:21159-1)	Nessus	SuSE Local Security Checks	high
323328	Linux Distros Unpatched Vulnerability : CVE-2026-23879	Nessus	Misc.	high
443668	SCA: security update for py7zr (GHSA-q6rc-2cgv-63h7)	Tenable Cloud Security	SCA Checks	high
443668	SCA: security update for py7zr (GHSA-q6rc-2cgv-63h7)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2026-23879

high

Tenable Plugins

high

high

high

high