CVE WatchNov 9, 2026

CVE-2026-102643

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyn

CVSS

8.8

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 9, 2026 · Last modified: Nov 9, 2026 · CWE-22 · CWE-50

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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