SB2026100530 - Path traversal in AsyncSSH

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026100530

SB2026100530 - Path traversal in AsyncSSH

Published: October 5, 2026

Security Bulletin ID SB2026100530
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: CVE-2026-77473)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to write files to arbitrary locations on the client filesystem.

The vulnerability exists due to path traversal in SFTPClient._copy() when processing server-supplied directory entry filenames during recursive remote-to-local copies. A remote attacker can return a directory entry with a crafted filename to write files to arbitrary locations on the client filesystem.

User interaction is required to initiate a recursive remote-to-local copy.


Remediation

Install update from vendor's website.

References