{"id":"UBUNTU-CVE-2026-92091","details":"A flaw was found in jwcrypto. The JWK.import_key() function validates the key_ops JWK member for duplicate values using an algorithm with O(n^2) time complexity, and the length of key_ops is not bounded. A remote, unauthenticated attacker can supply a JWK with a large key_ops array to an application that passes attacker-controlled key material to a public key-import API (reachable via ECDH-ES key agreement, OIDC dynamic client registration, DPoP, or ACME account key registration, among others) to consume excessive CPU time, resulting in a denial of service.","modified":"2026-09-17T13:31:22.752988874Z","published":"2026-09-17T00:00:00Z","upstream":["CVE-2026-92091"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-92091"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-92091"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-92091"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533849"},{"type":"REPORT","url":"https://github.com/latchset/jwcrypto/security/advisories/GHSA-pwgw-f7xr-863h"}],"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_version":"0.2.1-1","binary_name":"python-jwcrypto"},{"binary_name":"python3-jwcrypto","binary_version":"0.2.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.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-2026-92091.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-2026-92091.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-2026-92091.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_name":"python3-jwcrypto","binary_version":"1.5.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.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_version":"1.5.6-1","binary_name":"python3-jwcrypto"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92091.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}