Security Update for libssh: Addressing Multiple Vulnerabilities
Summary
ALSA-2026:18160: Moderate: libssh security update. Affects libssh versions < 0.12.0-2.el10. Fixed in 0.12.0-2.el10. How to fix ↓
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Background
libssh is a widely used library that implements the SSH protocol, enabling secure communication between client and server applications. It is integral for various applications requiring secure file transfers and remote command execution. However, vulnerabilities in libssh can expose systems to significant risks, including unauthorized access and denial of service attacks.
Vulnerability Detail
The libssh library has several vulnerabilities that could lead to serious security issues. These include a buffer underflow in the ssh_get_hexa() function when handling invalid input (CVE-2026-0966), improper sanitation of paths from SCP servers (CVE-2026-0964), and multiple denial of service vulnerabilities due to improper configuration file handling (CVE-2026-0965), inefficient regular expression processing (CVE-2026-0967), and malformed SFTP messages (CVE-2026-0968). These vulnerabilities can lead to application crashes, unauthorized access, and service disruptions.
How To Fix
Minimum fixed version
0.12.0-2.el10
This is the first release that contains the fix.
sudo dnf update libsshTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If you are unable to update the package immediately, consider implementing strict input validation and sanitization in your applications that utilize libssh to mitigate the risks associated with these vulnerabilities.
Conclusion
The vulnerabilities in libssh pose significant risks to applications relying on this library for secure communication. It is crucial to update to the latest patched version to protect against potential exploits. Additionally, implementing workarounds can help mitigate risks until updates are applied.
See every vulnerability recorded for libssh →
FAQ
libssh is a library that implements the SSH protocol, allowing secure communication for client and server applications.
The vulnerabilities include buffer underflows, improper path sanitation, and denial of service issues.
You can use Vulert, which monitors open-source vulnerabilities in your software using a manifest file like package-lock.json. Visit Vulert Scanner to check your application without any signup.
Implement strict input validation and sanitization in your applications to mitigate risks until you can update.
For detailed information, refer to the CVE pages listed in the vulnerability report.
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