# CVE-2026-23879: py7zr: py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryp...

CVE-2026-23879 is fixed in 2 products on 1 platform, first by OPENSUSE-SU-2026:21159-1, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-23879
- Priority: High
- CVSS: 8.0 (high)
- EPSS: 0.0050
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | py7zr Debian 14 | 1.1.2+dfsg-1 | [DEBIAN-CVE-2026-23879](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23879.md) | Jun 26, 2026 |
| Linux | python-py7zr opensuse-leap 16.0 | 1.0.0-bp160.2.1 | [OPENSUSE-SU-2026:21159-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21159-1.md) | Jun 25, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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