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CVE-2026-102643 – AsyncSSH: SFTPServer Chroot Escape

Posted on November 10, 2026
CVE ID :CVE-2026-102643

Published : Nov. 9, 2026, 9:51 p.m. | 1 hour, 23 minutes ago

Description :AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.24.1, SFTPServer.map_path() uses posixpath.normpath() on a client-supplied path and removes only one leading slash before passing the result to posixpath.join() with the configured chroot. An authenticated SFTP user can supply a path beginning with exactly two slash characters, causing POSIX normalization to preserve the double-leading-slash form and the subsequent join to treat the remaining pathname as absolute. This bypasses the SFTP chroot and permits reads and writes with the operating-system permissions of the account running the server, which may enable code execution depending on writable targets. This issue is fixed in version 2.24.1.

Severity: 8.8 | HIGH

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