{"id":"UBUNTU-CVE-2026-101338","details":"When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).","modified":"2026-10-17T12:57:53.460430858Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-101338"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-101338"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-101338"},{"type":"REPORT","url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-101338.txt"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/10/14/12"}],"affected":[{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.2-1","4.1.6-1","4.1.7-1","4.1.7-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.1.7-1ubuntu0.1~esm1"},{"binary_name":"nsd3","binary_version":"4.1.7-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.16-1build1","4.1.17-1","4.1.17-1build1","4.1.17-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.1.17-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.26-1","4.1.26-1build1","4.1.26-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.1.26-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-1","4.3.7-1","4.3.8-1","4.3.8-1build1","4.3.9-1","4.3.9-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.3.9-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1","4.8.0-1","4.8.0-1build1","4.8.0-1build3","4.8.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.8.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.14.0-1","4.14.2-1","4.14.3-1","4.15.0-1","4.15.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"nsd","binary_version":"4.15.0-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}},{"package":{"name":"nsd","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.13.0-6","4.14.0-1","4.14.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.14.0-1ubuntu0.1~esm1","binary_name":"nsd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101338.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}