{"id":"USN-8539-1","summary":"gnutls28 vulnerabilities","details":"Haruto Kimura discovered that GnuTLS did not properly apply permitted\nname constraints in certain certificate validation paths. A remote\nattacker could possibly use this issue to bypass certificate validation,\nleading to a machine-in-the-middle attack. (CVE-2026-42011)\n\nOleh Konko discovered that GnuTLS incorrectly fell back to Common Name\nchecks for certain URI and SRV subject alternative names. A remote\nattacker could possibly use this issue to bypass certificate validation,\nleading to a machine-in-the-middle attack. (CVE-2026-42012)\n\nHaruto Kimura and Joshua Rogers discovered that GnuTLS incorrectly fell\nback to Common Name checks when subject alternative names were\noversized. A remote attacker could possibly use this issue to bypass\ncertificate validation, leading to a machine-in-the-middle attack.\n(CVE-2026-42013)\n\nLuigino Camastra and Joshua Rogers discovered that GnuTLS had a\nuse-after-free issue when changing PKCS#11 token security officer PINs\nin certain cases. An attacker could possibly use this issue to cause\nGnuTLS to crash, resulting in a denial of service, or execute arbitrary\ncode. (CVE-2026-42014)\n\nZou Dikai discovered that GnuTLS did not properly validate PKCS#12 bag\nsizes in certain cases. An attacker could possibly use this issue to\ncause GnuTLS to crash, resulting in a denial of service, or execute\narbitrary code. (CVE-2026-42015)","modified":"2026-07-14T23:44:42.938727941Z","published":"2026-07-14T15:16:35Z","related":["UBUNTU-CVE-2026-42011","UBUNTU-CVE-2026-42012","UBUNTU-CVE-2026-42013","UBUNTU-CVE-2026-42014","UBUNTU-CVE-2026-42015"],"upstream":["CVE-2026-42011","CVE-2026-42012","CVE-2026-42013","CVE-2026-42014","CVE-2026-42015","UBUNTU-CVE-2026-42011","UBUNTU-CVE-2026-42012","UBUNTU-CVE-2026-42013","UBUNTU-CVE-2026-42014","UBUNTU-CVE-2026-42015"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8539-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42011"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42012"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42013"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42014"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42015"}],"affected":[{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.10-4ubuntu1.9+esm4"}]}],"versions":["3.3.15-5ubuntu2","3.3.18-1ubuntu1","3.3.20-1ubuntu1","3.4.9-2ubuntu1","3.4.10-4ubuntu1","3.4.10-4ubuntu1.1","3.4.10-4ubuntu1.2","3.4.10-4ubuntu1.3","3.4.10-4ubuntu1.4","3.4.10-4ubuntu1.5","3.4.10-4ubuntu1.6","3.4.10-4ubuntu1.7","3.4.10-4ubuntu1.8","3.4.10-4ubuntu1.9","3.4.10-4ubuntu1.9+esm1","3.4.10-4ubuntu1.9+esm2","3.4.10-4ubuntu1.9+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.4.10-4ubuntu1.9+esm4"},{"binary_version":"3.4.10-4ubuntu1.9+esm4","binary_name":"guile-gnutls"},{"binary_name":"libgnutls-openssl27","binary_version":"3.4.10-4ubuntu1.9+esm4"},{"binary_version":"3.4.10-4ubuntu1.9+esm4","binary_name":"libgnutls30"},{"binary_version":"3.4.10-4ubuntu1.9+esm4","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8539-1.json","cves_map":{"cves":[{"id":"CVE-2026-42012","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-42013","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42015"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.18-1ubuntu1.6+esm4"}]}],"versions":["3.5.8-6ubuntu3","3.5.17-1ubuntu1","3.5.17-1ubuntu3","3.5.18-1ubuntu1","3.5.18-1ubuntu1.1","3.5.18-1ubuntu1.2","3.5.18-1ubuntu1.3","3.5.18-1ubuntu1.4","3.5.18-1ubuntu1.5","3.5.18-1ubuntu1.6","3.5.18-1ubuntu1.6+esm1","3.5.18-1ubuntu1.6+esm2","3.5.18-1ubuntu1.6+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_name":"libgnutls-dane0","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_version":"3.5.18-1ubuntu1.6+esm4","binary_name":"libgnutls-openssl27"},{"binary_version":"3.5.18-1ubuntu1.6+esm4","binary_name":"libgnutls30"},{"binary_version":"3.5.18-1ubuntu1.6+esm4","binary_name":"libgnutlsxx28"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42011"},{"id":"CVE-2026-42012","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42013"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42015"}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8539-1.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.13-2ubuntu1.12+esm3"}]}],"versions":["3.6.9-5ubuntu1","3.6.9-5ubuntu2","3.6.10-5","3.6.11.1-2","3.6.11.1-2ubuntu2","3.6.13-2ubuntu1","3.6.13-2ubuntu1.1","3.6.13-2ubuntu1.2","3.6.13-2ubuntu1.3","3.6.13-2ubuntu1.6","3.6.13-2ubuntu1.7","3.6.13-2ubuntu1.8","3.6.13-2ubuntu1.9","3.6.13-2ubuntu1.10","3.6.13-2ubuntu1.11","3.6.13-2ubuntu1.12","3.6.13-2ubuntu1.12+esm1","3.6.13-2ubuntu1.12+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.6.13-2ubuntu1.12+esm3","binary_name":"gnutls-bin"},{"binary_version":"3.6.13-2ubuntu1.12+esm3","binary_name":"guile-gnutls"},{"binary_version":"3.6.13-2ubuntu1.12+esm3","binary_name":"libgnutls-dane0"},{"binary_version":"3.6.13-2ubuntu1.12+esm3","binary_name":"libgnutls-openssl27"},{"binary_name":"libgnutls30","binary_version":"3.6.13-2ubuntu1.12+esm3"},{"binary_version":"3.6.13-2ubuntu1.12+esm3","binary_name":"libgnutlsxx28"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42011"},{"id":"CVE-2026-42012","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-42013","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-42014","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-42015","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8539-1.json"}}],"schema_version":"1.7.5"}