A vulnerability in libyang (CVE-2026-41401, CVSS 6.5 MEDIUM) involves incorrect handling of metadata list pointers, which could allow an attacker to cause a denial of service or execute arbitrary code via specially crafted network traffic. The vulnerability affects Ubuntu 26.04 LTS and 25.10, and the fix is provided by updating to libyang3 package versions 3.13.6-1ubuntu0.1 and 3.13.5-2ubuntu0.1, respectively.
Ubuntu Security Notices USN-8485-1 USN-8485-1: libyang vulnerability Publication date 30 June 2026 Overview libyang could be made to crash or run programs if it received specially crafted network traffic. Releases 26.04 LTS 25.10 Open side navigation Close side navigation Packages Details Update instructions References Packages libyang - parser toolkit for IETF YANG data modeling Details It was discovered that libyang incorrectly handled certain metadata list pointers. An attacker could use this issue to cause libyang to crash, resulting in a denial of service, or possibly execute arbitrary code. It was discovered that libyang incorrectly handled certain metadata list pointers. An attacker could use this issue to cause libyang to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute libyang3 – 3.13.6-1ubuntu0.1 25.10 questing libyang3 – 3.13.5-2ubuntu0.1 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-41401 CVE-2026-41401