{"id":"USN-8650-1","summary":"capnproto vulnerabilities","details":"Chanho Kim and Jihyeok Han discovered that Cap'n Proto incorrectly\nhandled negative Content-Length values or excessively large chunk sizes\nwhen processing HTTP messages. An attacker could possibly use these\nissues to cause HTTP messages to be interpreted inconsistently,\nresulting in HTTP request or response smuggling. (CVE-2026-32239,\nCVE-2026-32240)","modified":"2026-08-20T00:14:23.573921998Z","published":"2026-08-19T16:00:14Z","related":["UBUNTU-CVE-2026-32239","UBUNTU-CVE-2026-32240"],"upstream":["CVE-2026-32239","CVE-2026-32240","UBUNTU-CVE-2026-32239","UBUNTU-CVE-2026-32240"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8650-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32239"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32240"}],"affected":[{"package":{"name":"capnproto","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.1-1ubuntu1+esm1"}]}],"versions":["0.5.3-2ubuntu2","0.6.1-1","0.6.1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.1-1ubuntu1+esm1","binary_name":"capnproto"},{"binary_name":"libcapnp-0.6.1","binary_version":"0.6.1-1ubuntu1+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-32239","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-32240"}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8650-1.json"}},{"package":{"name":"capnproto","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.0-6ubuntu0.1~esm1"}]}],"versions":["0.7.0-5","0.7.0-5build1","0.7.0-6"],"ecosystem_specific":{"binaries":[{"binary_version":"0.7.0-6ubuntu0.1~esm1","binary_name":"capnproto"},{"binary_version":"0.7.0-6ubuntu0.1~esm1","binary_name":"libcapnp-0.7.0"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-32239"},{"id":"CVE-2026-32240","severity":[{"score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8650-1.json"}},{"package":{"name":"capnproto","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.0-2ubuntu2+esm1"}]}],"versions":["0.7.0-7build1","0.8.0-2ubuntu2"],"ecosystem_specific":{"availability":"Available 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