{"id":"USN-9011-1","summary":"pyasn1 vulnerabilities","details":"It was discovered that pyasn1 did not properly bound the size of long-form\ntag identifiers when parsing BER, CER, or DER encoded data. An attacker\ncould possibly use this issue to cause applications decoding untrusted\nASN.1 data to consume excessive CPU resources, resulting in a denial of\nservice. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,\nUbuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-59884)\n\nIt was discovered that pyasn1 processed OBJECT IDENTIFIER and RELATIVE-OID\nvalues in quadratic time relative to the number of arcs. An attacker could\npossibly use this issue to cause applications decoding untrusted ASN.1 data\nto consume excessive CPU resources, resulting in a denial of service. This\nissue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nand Ubuntu 20.04 LTS. (CVE-2026-59885)\n\nIt was discovered that pyasn1 incorrectly handled conversion of decoded\nREAL values to Python float types. An attacker could possibly use this\nissue to cause applications decoding untrusted ASN.1 data to consume\nexcessive CPU and memory resources, resulting in a denial of service. This\nissue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nand Ubuntu 20.04 LTS. (CVE-2026-59886)\n\nIt was discovered that pyasn1 incorrectly handled tracking component types\nwhen decoding containers without a schema. An attacker could possibly use\nthis issue to cause applications decoding untrusted ASN.1 data to consume\nexcessive CPU resources, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04\nLTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-119194)\n\nIt was discovered that pyasn1 processed fragmented constructed strings and\nindefinite-length ANY values in quadratic time. An attacker could possibly\nuse this issue to cause applications decoding untrusted ASN.1 data to\nconsume excessive CPU resources, resulting in a denial of service. This\nissue was only addressed in Ubuntu 26.04 LTS and Ubuntu 26.10.\n(CVE-2026-119195)\n\nIt was discovered that pyasn1 processed fragmented constructed BIT STRING\nvalues in quadratic time. An attacker could possibly use this issue to\ncause applications decoding untrusted ASN.1 data to consume excessive CPU\nresources, resulting in a denial of service. (CVE-2026-119196)\n\nIt was discovered that pyasn1 processed binary-encoded REAL values with\nlarge mantissas in quadratic time. An attacker could possibly use this\nissue to cause applications decoding untrusted ASN.1 data to consume\nexcessive CPU resources, resulting in a denial of service.\n(CVE-2026-119197)","modified":"2026-11-10T02:58:35.172347868Z","published":"2026-11-09T16:15:14Z","upstream":["CVE-2026-119194","CVE-2026-119195","CVE-2026-119196","CVE-2026-119197","CVE-2026-59884","CVE-2026-59885","CVE-2026-59886","UBUNTU-CVE-2026-119194","UBUNTU-CVE-2026-119195","UBUNTU-CVE-2026-119196","UBUNTU-CVE-2026-119197","UBUNTU-CVE-2026-59884","UBUNTU-CVE-2026-59885","UBUNTU-CVE-2026-59886"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-9011-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-59884"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-59885"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-59886"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119194"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119195"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119196"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119197"}],"affected":[{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.7-1ubuntu2.1+esm2"}]}],"versions":["0.1.4-0ubuntu1","0.1.7-1ubuntu1","0.1.7-1ubuntu2","0.1.7-1ubuntu2.1","0.1.7-1ubuntu2.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"python-pyasn1","binary_version":"0.1.7-1ubuntu2.1+esm2"},{"binary_name":"python3-pyasn1","binary_version":"0.1.7-1ubuntu2.1+esm2"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.9-1ubuntu0.1~esm2"}]}],"versions":["0.1.8-2","0.1.9-1","0.1.9-1ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"0.1.9-1ubuntu0.1~esm2","binary_name":"pypy-pyasn1"},{"binary_name":"python-pyasn1","binary_version":"0.1.9-1ubuntu0.1~esm2"},{"binary_version":"0.1.9-1ubuntu0.1~esm2","binary_name":"python3-pyasn1"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2-3ubuntu0.18.04.1~esm2"}]}],"versions":["0.1.9-2","0.4.2-3","0.4.2-3ubuntu0.18.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"pypy-pyasn1","binary_version":"0.4.2-3ubuntu0.18.04.1~esm2"},{"binary_name":"python-pyasn1","binary_version":"0.4.2-3ubuntu0.18.04.1~esm2"},{"binary_version":"0.4.2-3ubuntu0.18.04.1~esm2","binary_name":"python3-pyasn1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2-3ubuntu0.20.04.1~esm2"}]}],"versions":["0.4.2-3","0.4.2-3build1","0.4.2-3ubuntu0.20.04.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"pypy-pyasn1","binary_version":"0.4.2-3ubuntu0.20.04.1~esm2"},{"binary_version":"0.4.2-3ubuntu0.20.04.1~esm2","binary_name":"python-pyasn1"},{"binary_name":"python3-pyasn1","binary_version":"0.4.2-3ubuntu0.20.04.1~esm2"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.8-1ubuntu0.4"}]}],"versions":["0.4.8-1","0.4.8-1ubuntu0.1","0.4.8-1ubuntu0.2","0.4.8-1ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.8-1ubuntu0.4","binary_name":"pypy-pyasn1"},{"binary_version":"0.4.8-1ubuntu0.4","binary_name":"python3-pyasn1"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.8-4ubuntu0.4"}]}],"versions":["0.4.8-4","0.4.8-4ubuntu0.1","0.4.8-4ubuntu0.2","0.4.8-4ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-pyasn1","binary_version":"0.4.8-4ubuntu0.4"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.4-1ubuntu0.1"}]}],"versions":["0.6.3-1","0.6.4-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-pyasn1","binary_version":"0.6.4-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json","cves_map":{"cves":[],"ecosystem":"Ubuntu:26.10"}}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.3-1ubuntu0.2"}]}],"versions":["0.6.1-1","0.6.1-1build1","0.6.2-1","0.6.3-1","0.6.3-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-pyasn1","binary_version":"0.6.3-1ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9011-1.json","cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[]}}}],"schema_version":"1.9.2"}