{"id":"USN-8104-1","summary":"flask vulnerability","details":"Shourya Jaiswal discovered that Flask did not correctly mark certain web\nresponses as user-specific. A remote attacker could possibly use this\nissue to obtain sensitive information.","modified":"2026-03-19T08:43:59.523116Z","published":"2026-03-18T03:18:47Z","related":["UBUNTU-CVE-2026-27205"],"upstream":["CVE-2026-27205","UBUNTU-CVE-2026-27205"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8104-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27205"}],"affected":[{"package":{"name":"flask","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/flask@1.1.1-2ubuntu0.1+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.1-2ubuntu0.1+esm1"}]}],"versions":["1.0.2-3","1.1.1-2","1.1.1-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.1-2ubuntu0.1+esm1","binary_name":"python3-flask"}],"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-8104-1.json","cves_map":{"cves":[{"id":"CVE-2026-27205","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}},{"package":{"name":"flask","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/flask@2.0.1-2ubuntu1.2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.1-2ubuntu1.2"}]}],"versions":["1.1.2-2","2.0.1-2ubuntu1","2.0.1-2ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.1-2ubuntu1.2","binary_name":"python3-flask"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json","cves_map":{"cves":[{"id":"CVE-2026-27205","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"}}},{"package":{"name":"flask","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/flask@3.0.2-1ubuntu1.1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.2-1ubuntu1.1"}]}],"versions":["2.2.5-1ubuntu1","3.0.2-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.2-1ubuntu1.1","binary_name":"python3-flask"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json","cves_map":{"cves":[{"id":"CVE-2026-27205","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}}],"schema_version":"1.7.5"}