SB2026100529 - Infinite loop in AsyncSSH

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Main Vulnerability Database SB2026100529

SB2026100529 - Infinite loop in AsyncSSH

Published: October 5, 2026

Security Bulletin ID SB2026100529
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Infinite loop (CVE-ID: CVE-2026-62949)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to an infinite loop caused by missing lower-bound validation in AsyncSSH channel handling when processing an SSH channel open message with a maximum packet size of zero. A remote user can send a crafted SSH channel open message to cause a denial of service.

On affected servers, a single malicious channel can freeze all current and future connections.


Remediation

Install update from vendor's website.

References