{"id":"USN-8087-3","summary":"python-cryptography vulnerability","details":"USN-8087-1 fixed a vulnerability in python-cryptography. This update\nprovides the corresponding update to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nand Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n It was discovered that python-cryptography incorrectly handled subgroup\n validation for SECT curves. A remote attacker could use this issue to\n perform a subgroup attack and possibly recover the least significant bits\n of private keys.","modified":"2026-05-20T16:03:57.331013728Z","published":"2026-04-28T11:04:02Z","related":["UBUNTU-CVE-2026-26007"],"upstream":["UBUNTU-CVE-2026-26007"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8087-3"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-26007"}],"affected":[{"package":{"name":"python-cryptography","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.3-1ubuntu0.3+esm3"}]}],"versions":["1.0.1-1ubuntu1","1.0.2-1","1.1-1","1.1.1-1","1.1.1-1ubuntu1","1.1.1-1ubuntu2","1.1.1-1ubuntu3","1.2.2-2","1.2.3-1","1.2.3-1ubuntu0.1","1.2.3-1ubuntu0.2","1.2.3-1ubuntu0.3","1.2.3-1ubuntu0.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-cryptography","binary_version":"1.2.3-1ubuntu0.3+esm3"},{"binary_name":"python3-cryptography","binary_version":"1.2.3-1ubuntu0.3+esm3"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json","cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"python-cryptography","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.4-1ubuntu1.4+esm3"}]}],"versions":["1.9-1","2.1.3-3","2.1.4-1","2.1.4-1build1","2.1.4-1build2","2.1.4-1ubuntu1","2.1.4-1ubuntu1.1","2.1.4-1ubuntu1.2","2.1.4-1ubuntu1.3","2.1.4-1ubuntu1.4","2.1.4-1ubuntu1.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-cryptography","binary_version":"2.1.4-1ubuntu1.4+esm3"},{"binary_name":"python3-cryptography","binary_version":"2.1.4-1ubuntu1.4+esm3"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json","cves_map":{"cves":[{"id":"CVE-2026-26007","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"python-cryptography","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8-3ubuntu0.3+esm2"}]}],"versions":["2.6.1-3.1","2.6.1-4","2.6.1-4ubuntu1","2.8-1ubuntu2","2.8-2","2.8-3","2.8-3ubuntu0.1","2.8-3ubuntu0.2","2.8-3ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_name":"python-cryptography","binary_version":"2.8-3ubuntu0.3+esm2"},{"binary_name":"python3-cryptography","binary_version":"2.8-3ubuntu0.3+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8087-3.json","cves_map":{"cves":[{"id":"CVE-2026-26007","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}}],"schema_version":"1.7.5"}