{"id":"USN-8134-1","summary":"pyasn1 vulnerabilities","details":"It was discovered that pyasn1 could exhaust system resources when\nattempting to decode a malformed certificate. An attacker could\npossibly use this to cause a denial of service. (CVE-2026-23490)\n\nKevin Tu discovered that pyasn1 could exhaust system resources via\nuncontrolled recursion when attempting to decode malicously-crafted\ncertificates. An attacker could possibly use this to cause a denial of\nservice. (CVE-2026-30922)","modified":"2026-03-31T18:16:28.986117Z","published":"2026-03-30T19:57:29Z","related":["UBUNTU-CVE-2026-23490","UBUNTU-CVE-2026-30922"],"upstream":["CVE-2026-23490","CVE-2026-30922","UBUNTU-CVE-2026-23490","UBUNTU-CVE-2026-30922"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8134-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-23490"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-30922"}],"affected":[{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/pyasn1@0.1.7-1ubuntu2.1+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.7-1ubuntu2.1+esm1"}]}],"versions":["0.1.4-0ubuntu1","0.1.7-1ubuntu1","0.1.7-1ubuntu2","0.1.7-1ubuntu2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.1.7-1ubuntu2.1+esm1","binary_name":"python-pyasn1"},{"binary_version":"0.1.7-1ubuntu2.1+esm1","binary_name":"python3-pyasn1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8134-1.json","cves_map":{"cves":[{"id":"CVE-2026-23490","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-30922","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:14.04:LTS"}}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pyasn1@0.1.9-1ubuntu0.1~esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.9-1ubuntu0.1~esm1"}]}],"versions":["0.1.8-2","0.1.9-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.1.9-1ubuntu0.1~esm1","binary_name":"pypy-pyasn1"},{"binary_version":"0.1.9-1ubuntu0.1~esm1","binary_name":"python-pyasn1"},{"binary_version":"0.1.9-1ubuntu0.1~esm1","binary_name":"python3-pyasn1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8134-1.json","cves_map":{"cves":[{"id":"CVE-2026-23490","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-30922","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pyasn1@0.4.2-3ubuntu0.18.04.1~esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2-3ubuntu0.18.04.1~esm1"}]}],"versions":["0.1.9-2","0.4.2-3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.2-3ubuntu0.18.04.1~esm1","binary_name":"pypy-pyasn1"},{"binary_version":"0.4.2-3ubuntu0.18.04.1~esm1","binary_name":"python-pyasn1"},{"binary_version":"0.4.2-3ubuntu0.18.04.1~esm1","binary_name":"python3-pyasn1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8134-1.json","cves_map":{"cves":[{"id":"CVE-2026-23490","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-30922","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/pyasn1@0.4.2-3ubuntu0.20.04.1~esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2-3ubuntu0.20.04.1~esm1"}]}],"versions":["0.4.2-3","0.4.2-3build1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.2-3ubuntu0.20.04.1~esm1","binary_name":"pypy-pyasn1"},{"binary_version":"0.4.2-3ubuntu0.20.04.1~esm1","binary_name":"python-pyasn1"},{"binary_version":"0.4.2-3ubuntu0.20.04.1~esm1","binary_name":"python3-pyasn1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8134-1.json","cves_map":{"cves":[{"id":"CVE-2026-23490","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-30922","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}}],"schema_version":"1.7.5"}