Critical Security Flaw in libyang: Denial of Service and Code Execution Risk
Summary
ALSA-2026:25051: Important: libyang security update. Affects libyang versions < 2.1.148-1.el9_8.1. Fixed in 2.1.148-1.el9_8.1. 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
Libyang is a YANG data modeling language parser and toolkit written in C, providing an API for developers to work with YANG data models. It is widely used in network management and configuration applications, allowing for structured data representation. However, a recent vulnerability has been identified that could expose systems using libyang to significant risks, including denial of service and arbitrary code execution.
Vulnerability Detail
The vulnerability in libyang arises from its handling of maliciously crafted LYB binary blobs. Attackers can exploit this flaw to cause a denial of service, potentially crashing the application or executing arbitrary code. This issue is tracked under CVE-2026-44673 and poses a serious threat to systems relying on libyang for data modeling, as it can lead to unauthorized access and control over affected systems.
How To Fix
Minimum fixed version
2.1.148-1.el9_8.1
This is the first release that contains the fix.
sudo dnf update libyangTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds available to mitigate this vulnerability without applying the patch. Users are strongly advised to update to the fixed version as soon as possible to protect their systems.
Conclusion
The libyang vulnerability identified as CVE-2026-44673 poses significant risks, including denial of service and arbitrary code execution. It is crucial for users to update to the patched version to safeguard their systems. Regular monitoring for vulnerabilities using tools like Vulert can help maintain security in open-source applications.
See every vulnerability recorded for libyang →
FAQ
CVE-2026-44673 is the identifier for the security vulnerability found in libyang, which can lead to denial of service or arbitrary code execution.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities. By simply providing a manifest file like package-lock.json, Vulert can help you identify if your application is affected by this vulnerability.
Failing to update libyang exposes your application to potential denial of service attacks and arbitrary code execution, which can compromise system integrity and security.
Currently, there are no effective workarounds to mitigate this vulnerability without applying the patch. Updating is the recommended course of action.
For detailed information about the vulnerability, including its impact and CVSS score, refer to the CVE page associated with CVE-2026-44673.
Related vulnerabilities
Recent vulnerabilities recorded for libyang.
