OPENSUSE-SU-2026:21159-1

Vulnerability from csaf_opensuse - Published: 2026-06-25 15:31 - Updated: 2026-09-17 17:37
Summary
Security update for python-py7zr
Severity
Important
Notes
Title of the patch: Security update for python-py7zr
Description of the patch: This update for python-py7zr fixes the following issues: 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)
Patchnames: openSUSE-Leap-16.0-packagehub-354
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-23879
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:python313-py7zr-0:1.0.0-bp160.2.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-55195
Affected products
Recommended 1 product, the same list as for CVE-2026-23879
Threats
Impact moderate
CVE-2026-55206
Affected products
Recommended 1 product, the same list as for CVE-2026-23879
Threats
Impact moderate
References
To clipboard 

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        "text": "This update for python-py7zr fixes the following issues:\n\nChanges in python-py7zr:\n\n- CVE-2026-23879: crafted malicious symbolic link chains in an archive can\n  lead to an arbitrary file write (bsc#1268669)\n- CVE-2026-55195: unchecked extraction size can cause a denial of service (bsc#1268665)\n- CVE-2026-55206: crafted .7z archive with a large numstreams value can\n  cause a denial of service (bsc#1268666)\n",
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          "text": "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.",
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          "text": "py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr\u0027s Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.",
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          "category": "general",
          "text": "py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3.",
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}



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