{"id":"UBUNTU-CVE-2025-11683","details":"YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values.  There is no indication that the issue leads to accessing memory outside that allocated to the module.","modified":"2026-05-20T16:20:20.111044010Z","published":"2025-10-16T01:15:00Z","upstream":["CVE-2025-11683"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-11683"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-11683"},{"type":"REPORT","url":"https://github.com/cpan-authors/YAML-Syck/pull/65"},{"type":"REPORT","url":"https://github.com/cpan-authors/YAML-Syck/commit/dcf4c8477b82ef439f43fd20dc099082d096df02"}],"affected":[{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.29-1ubuntu0.16.04.1~esm1"}]}],"versions":["1.27-2build2","1.29-1","1.29-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyaml-syck-perl","binary_version":"1.29-1ubuntu0.16.04.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.29-1ubuntu0.18.04.1~esm1"}]}],"versions":["1.29-1build3"],"ecosystem_specific":{"binaries":[{"binary_name":"libyaml-syck-perl","binary_version":"1.29-1ubuntu0.18.04.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.31-1ubuntu0.1~esm1"}]}],"versions":["1.31-1","1.31-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyaml-syck-perl","binary_version":"1.31-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34-1ubuntu0.1~esm1"}]}],"versions":["1.34-1build1","1.34-1build2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libyaml-syck-perl","binary_version":"1.34-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34-2ubuntu0.24.04.1~esm1"}]}],"versions":["1.34-2","1.34-2build1","1.34-2build2","1.34-2build3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.34-2ubuntu0.24.04.1~esm1","binary_name":"libyaml-syck-perl"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34-3ubuntu0.1"}]}],"versions":["1.34-2build4","1.34-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.34-3ubuntu0.1","binary_name":"libyaml-syck-perl"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}},{"package":{"name":"libyaml-syck-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.34-3","1.34-4","1.36-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyaml-syck-perl","binary_version":"1.36-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-11683.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}