{"id":"UBUNTU-CVE-2026-5419","details":"A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.","modified":"2026-06-03T13:39:57.332068830Z","published":"2026-04-30T00:00:00Z","related":["USN-8284-1"],"upstream":["CVE-2026-5419"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5419"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-5419"},{"type":"REPORT","url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-13"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8284-1"}],"affected":[{"package":{"name":"gnutls28","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.3-1.1ubuntu3.6"}]}],"versions":["3.8.1-4ubuntu1","3.8.1-4ubuntu6","3.8.1-4ubuntu7","3.8.3-1ubuntu1","3.8.3-1.1ubuntu2","3.8.3-1.1ubuntu3","3.8.3-1.1ubuntu3.1","3.8.3-1.1ubuntu3.2","3.8.3-1.1ubuntu3.3","3.8.3-1.1ubuntu3.4","3.8.3-1.1ubuntu3.5"],"ecosystem_specific":{"binaries":[{"binary_version":"3.8.3-1.1ubuntu3.6","binary_name":"gnutls-bin"},{"binary_name":"libgnutls-dane0t64","binary_version":"3.8.3-1.1ubuntu3.6"},{"binary_version":"3.8.3-1.1ubuntu3.6","binary_name":"libgnutls-openssl27t64"},{"binary_name":"libgnutls30t64","binary_version":"3.8.3-1.1ubuntu3.6"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5419.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:FIPS-updates:24.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=fips-updates%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.3-1.1ubuntu3.6+Fips1.2"}]}],"versions":["3.8.3-1.1ubuntu3.1+Fips1","3.8.3-1.1ubuntu3.4+Fips1","3.8.3-1.1ubuntu3.4+Fips1.1","3.8.3-1.1ubuntu3.5+Fips1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"gnutls-bin","binary_version":"3.8.3-1.1ubuntu3.6+Fips1.2"},{"binary_version":"3.8.3-1.1ubuntu3.6+Fips1.2","binary_name":"libgnutls-dane0t64"},{"binary_name":"libgnutls-openssl27t64","binary_version":"3.8.3-1.1ubuntu3.6+Fips1.2"},{"binary_name":"libgnutls30t64","binary_version":"3.8.3-1.1ubuntu3.6+Fips1.2"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5419.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.9-3ubuntu2.2"}]}],"versions":["3.8.9-2ubuntu3","3.8.9-3ubuntu1","3.8.9-3ubuntu2","3.8.9-3ubuntu2.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.8.9-3ubuntu2.2","binary_name":"gnutls-bin"},{"binary_name":"libgnutls-dane0t64","binary_version":"3.8.9-3ubuntu2.2"},{"binary_name":"libgnutls-openssl27t64","binary_version":"3.8.9-3ubuntu2.2"},{"binary_name":"libgnutls30t64","binary_version":"3.8.9-3ubuntu2.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5419.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.12-2ubuntu1.1"}]}],"versions":["3.8.9-3ubuntu2","3.8.10-3ubuntu1","3.8.12-2ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.8.12-2ubuntu1.1"},{"binary_version":"3.8.12-2ubuntu1.1","binary_name":"libgnutls-dane0t64"},{"binary_name":"libgnutls-openssl27t64","binary_version":"3.8.12-2ubuntu1.1"},{"binary_name":"libgnutls30t64","binary_version":"3.8.12-2ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5419.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}