{"id":"UBUNTU-CVE-2026-119197","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, binary REAL decoding builds a large mantissa one octet at a time by shifting a growing integer and slicing the remaining byte string. Attacker-controlled ASN.1 includes a binary-encoded REAL with a large mantissa and reaches BER, CER, or DER decode(), with or without a schema containing REAL. RealPayloadDecoder.valueDecoder repeatedly performs a left shift, OR, and suffix copy for every mantissa octet, making decode time quadratic in mantissa length. A comparatively small REAL value can hold a decoding worker on one CPU core for seconds or longer and cause availability loss. This issue is fixed in version 0.6.5.","modified":"2026-11-10T02:50:21.785086424Z","published":"2026-10-29T20:17:00Z","upstream":["CVE-2026-119197"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119197"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-119197"},{"type":"REPORT","url":"https://github.com/pyasn1/pyasn1/commit/ce3ec3390784780a530047e0e77be5ff457636a4"},{"type":"REPORT","url":"https://github.com/pyasn1/pyasn1/pull/132"},{"type":"REPORT","url":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5"},{"type":"REPORT","url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-mm57-4v3p-rchx"}],"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"}]}],"versions":["0.1.4-0ubuntu1","0.1.7-1ubuntu1","0.1.7-1ubuntu2","0.1.7-1ubuntu2.1","0.1.7-1ubuntu2.1+esm1","0.1.7-1ubuntu2.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"python-pyasn1","binary_version":"0.1.7-1ubuntu2.1+esm2"},{"binary_version":"0.1.7-1ubuntu2.1+esm2","binary_name":"python3-pyasn1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.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"}]}],"versions":["0.1.8-2","0.1.9-1","0.1.9-1ubuntu0.1~esm1","0.1.9-1ubuntu0.1~esm2"],"ecosystem_specific":{"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":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.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"}]}],"versions":["0.1.9-2","0.4.2-3","0.4.2-3ubuntu0.18.04.1~esm1","0.4.2-3ubuntu0.18.04.1~esm2"],"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.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"}]}],"versions":["0.4.2-3","0.4.2-3build1","0.4.2-3ubuntu0.20.04.1~esm1","0.4.2-3ubuntu0.20.04.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"pypy-pyasn1","binary_version":"0.4.2-3ubuntu0.20.04.1~esm2"},{"binary_name":"python-pyasn1","binary_version":"0.4.2-3ubuntu0.20.04.1~esm2"},{"binary_name":"python3-pyasn1","binary_version":"0.4.2-3ubuntu0.20.04.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8-1","0.4.8-1ubuntu0.1","0.4.8-1ubuntu0.2","0.4.8-1ubuntu0.3","0.4.8-1ubuntu0.4"],"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8-4","0.4.8-4ubuntu0.1","0.4.8-4ubuntu0.2","0.4.8-4ubuntu0.3","0.4.8-4ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.8-4ubuntu0.4","binary_name":"python3-pyasn1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119197.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.3-1","0.6.4-1","0.6.4-1ubuntu0.1"],"ecosystem_specific":{"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/cve/2026/UBUNTU-CVE-2026-119197.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:2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