Critical Security Update for OpenSSH: Information Disclosure and Denial of Service Vulnerability
Summary
ALSA-2026:6461: Important: openssh security update. Affects openssh versions < 8.0p1-28.el8_10. Fixed in 8.0p1-28.el8_10. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
OpenSSH is a widely used implementation of the SSH (Secure Shell) protocol, providing secure communication over unsecured networks. It is essential for secure remote administration and file transfers. The package includes both client and server components, making it versatile for various operating systems, including Linux and UNIX. However, it has been found vulnerable to an issue that could lead to information disclosure or denial of service due to uninitialized variables.
Vulnerability Detail
The vulnerability identified as CVE-2026-3497 affects OpenSSH's GSSAPI (Generic Security Services Application Program Interface) implementation. It arises from the use of uninitialized variables, which can potentially lead to unintended information disclosure or a denial of service condition. Attackers exploiting this vulnerability may gain access to sensitive information or disrupt service availability, posing a significant risk to systems relying on OpenSSH for secure communications.
How To Fix
Minimum fixed version
8.0p1-28.el8_10
This is the first release that contains the fix.
sudo dnf update opensshTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling GSSAPI authentication in your SSH configuration until the update can be applied. You can do this by editing the SSH configuration file (usually located at /etc/ssh/sshd_config) and adding or modifying the following line:
GSSAPIAuthentication no
After making this change, restart the SSH service with:
sudo systemctl restart sshd
Conclusion
The OpenSSH security update addresses a critical vulnerability that could lead to information disclosure and denial of service. It is essential for users to update their packages to the patched version to ensure the security of their systems. Utilizing tools like Vulert can further enhance vulnerability management by providing real-time alerts.
See every vulnerability recorded for openssh →
FAQ
The impact includes potential information disclosure and denial of service, which can compromise the security and availability of systems using OpenSSH.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring installation.
If an immediate update is not possible, consider disabling GSSAPI authentication as a temporary workaround until you can apply the patch.
The vulnerability specifically affects versions prior to 8.0p1-28.el8_10. Ensure your version is updated to this or later to mitigate the risk.
Vulert provides real-time monitoring and alerts for open-source vulnerabilities, allowing developers to maintain secure applications without needing to access the code directly.
Related vulnerabilities
Recent vulnerabilities recorded for openssh.
