{"id":"UBUNTU-CVE-2026-84185","details":"A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.","modified":"2026-09-16T11:43:10Z","published":"2026-09-03T21:17:00Z","upstream":["CVE-2026-84185"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-84185"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-84185"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2526729"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-84185"}],"affected":[{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-jwcrypto","binary_version":"0.2.1-1"},{"binary_version":"0.2.1-1","binary_name":"python3-jwcrypto"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3.2-1","0.4.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-jwcrypto","binary_version":"0.4.2-1"},{"binary_name":"python3-jwcrypto","binary_version":"0.4.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.0-1","0.6.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.0-2","binary_name":"python3-jwcrypto"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.0-1","1.0.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-jwcrypto","binary_version":"1.0.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-1","1.5.4-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.5.4-1","binary_name":"python3-jwcrypto"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-jwcrypto","binary_version":"1.5.6-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84185.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}