CVE-2026-23879— Hiroshi Miura py7zr 后置链接漏洞

py7zr: Arbitrary File Write Vulnerability

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

在文件访问前对链接解析不恰当(链接跟随)

Hiroshi Miura py7zr 后置链接漏洞

Hiroshi Miura py7zr是日本Hiroshi Miura个人开发者的一个7z文件压缩解压的Python库。 Hiroshi Miura py7zr 1.1.2版本及之前版本存在后置链接漏洞，该漏洞源于任意文件写入问题，攻击者通过特制恶意符号链接链可绕过解压目录边界限制，导致在主机文件系统上写入任意文件，可能导致远程代码执行、权限提升、数据损坏或拒绝服务。

N/A

N/A