OpenSSH<10.4 DisableForwarding fails to block PermitTunnel
CVE-2026-59999 Published on July 8, 2026
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
Vulnerability Analysis
CVE-2026-59999 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
Use of Less Trusted Source
The software has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.
Products Associated with CVE-2026-59999
Want to know whenever a new CVE is published for OpenBSD OpenSSH? stack.watch will email you.
Affected Versions
OpenBSD OpenSSH:- Before 10.4 is affected.