Improper Neutralization of Argument Delimiters in a Command in OpenSSH - CVE-2026-59997
Published: July 15, 2026
Vulnerability identifier: #VU137700
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-59997
CWE-ID: CWE-88
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSH
Affected software:
OpenSSH
OpenSSH
Detailed vulnerability description
The vulnerability allows a remote user to bypass security-relevant SFTP server options.
The vulnerability exists due to improper input handling in the internal-sftp SFTP server implementation when processing long command lines. A remote privileged user can supply a command line with security-relevant options placed after the ninth argument to bypass security-relevant SFTP server options.
Only configurations using the internal-sftp SFTP server implementation are affected.
How to mitigate CVE-2026-59997
Install security update from vendor's website.