{"id":"UBUNTU-CVE-2026-119195","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed string and indefinite-length ANY decoding repeatedly concatenates each fragment onto a growing bytes value. Attacker-controlled BER or CER data can use many constructed OCTET STRING or character-string fragments. DER rejects constructed OCTET STRING without a schema, but accepts its definite-length form when asn1Spec selects univ.OctetString; it also accepts constructed character strings such as UTF8String without a schema, even though those encodings are not valid DER. The separate indefinite-length ANY path is reachable in BER and CER when asn1Spec selects univ.Any; DER rejects indefinite lengths. OctetStringPayloadDecoder uses growing header concatenation and AnyPayloadDecoder.indefLenValueDecoder uses growing chunk concatenation, repeatedly copying an increasing prefix and causing quadratic work. A sufficiently fragmented value can occupy decoding workers and cause CPU exhaustion without confidentiality or integrity impact. This issue is fixed in version 0.6.5.","modified":"2026-11-10T02:50:21.261021383Z","published":"2026-10-29T20:17:00Z","upstream":["CVE-2026-119195"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119195"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-119195"},{"type":"REPORT","url":"https://github.com/pyasn1/pyasn1/commit/4ce00797c594b59c1fd6b86d9ebc3ba87b7ec9f9"},{"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-9m75-vc3g-4x39"}],"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-2026-119195.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_name":"pypy-pyasn1","binary_version":"0.1.9-1ubuntu0.1~esm2"},{"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-2026-119195.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-2026-119195.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_version":"0.4.2-3ubuntu0.20.04.1~esm2","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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119195.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_name":"pypy-pyasn1","binary_version":"0.4.8-1ubuntu0.4"},{"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-2026-119195.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_name":"python3-pyasn1","binary_version":"0.4.8-4ubuntu0.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119195.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_version":"0.6.4-1ubuntu0.1","binary_name":"python3-pyasn1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119195.json"}},{"package":{"name":"pyasn1","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/pyasn1?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1-1","0.6.1-1build1","0.6.2-1","0.6.3-1","0.6.3-1ubuntu0.1","0.6.3-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.3-1ubuntu0.2","binary_name":"python3-pyasn1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119195.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}