{"id":"UBUNTU-CVE-2026-44673","details":"libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.","modified":"2026-06-16T21:45:14.775318366Z","published":"2026-05-14T21:16:00Z","withdrawn":"2026-06-16T19:55:01Z","upstream":["CVE-2026-44673"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-44673"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-44673"},{"type":"REPORT","url":"https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh"}],"affected":[{"package":{"name":"libyang","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libyang?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.16.105-1","0.16.105-2","0.16.105-3","0.16.105-3build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang-cpp0.16","binary_version":"0.16.105-3build1"},{"binary_name":"libyang0.16","binary_version":"0.16.105-3build1"},{"binary_name":"python3-yang","binary_version":"0.16.105-3build1"},{"binary_name":"yang-tools","binary_version":"0.16.105-3build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}},{"package":{"name":"libyang","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libyang?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.225-1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang-cpp1","binary_version":"1.0.225-1.1"},{"binary_version":"1.0.225-1.1","binary_name":"libyang-tools"},{"binary_name":"libyang1","binary_version":"1.0.225-1.1"},{"binary_name":"yang-tools","binary_version":"1.0.225-1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}},{"package":{"name":"libyang2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libyang2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.112-6","2.0.112-6ubuntu1","2.0.112-6ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.112-6ubuntu2","binary_name":"libyang-tools"},{"binary_name":"libyang2","binary_version":"2.0.112-6ubuntu2"},{"binary_name":"libyang2-tools","binary_version":"2.0.112-6ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}},{"package":{"name":"libyang2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libyang2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.30-2","2.1.30-2.1","2.1.30-2.1build1","2.1.30-2.1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang-tools","binary_version":"2.1.30-2.1ubuntu0.1"},{"binary_name":"libyang2-tools","binary_version":"2.1.30-2.1ubuntu0.1"},{"binary_version":"2.1.30-2.1ubuntu0.1","binary_name":"libyang2t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}},{"package":{"name":"libyang","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libyang?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.8-3","3.12.2-1","3.12.2-1ubuntu1","3.13.5-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang3","binary_version":"3.13.5-2"},{"binary_name":"libyang3-tools","binary_version":"3.13.5-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}},{"package":{"name":"libyang","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libyang?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.13.5-2","3.13.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang3","binary_version":"3.13.6-1"},{"binary_name":"libyang3-tools","binary_version":"3.13.6-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44673.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}