{"id":"UBUNTU-CVE-2026-32240","details":"Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.","modified":"2026-08-20T00:00:20.398970296Z","published":"2026-03-12T20:16:00Z","related":["USN-8650-1"],"upstream":["CVE-2026-32240"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32240"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-32240"},{"type":"REPORT","url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8650-1"}],"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":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"0.6.1-1ubuntu1+esm1","binary_name":"capnproto"},{"binary_name":"libcapnp-0.6.1","binary_version":"0.6.1-1ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.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_name":"capnproto","binary_version":"0.7.0-6ubuntu0.1~esm1"},{"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":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.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 with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"0.8.0-2ubuntu2+esm1","binary_name":"capnproto"},{"binary_name":"libcapnp-0.8.0","binary_version":"0.8.0-2ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.json"}},{"package":{"name":"capnproto","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1-4ubuntu0.1~esm1"}]}],"versions":["0.9.2-3","1.0.1-2","1.0.1-3","1.0.1-4"],"ecosystem_specific":{"binaries":[{"binary_name":"capnproto","binary_version":"1.0.1-4ubuntu0.1~esm1"},{"binary_name":"libcapnp-1.0.1","binary_version":"1.0.1-4ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.json"}},{"package":{"name":"capnproto","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.0-2","binary_name":"capnproto"},{"binary_name":"libcapnp-1.1.0","binary_version":"1.1.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.json"}},{"package":{"name":"capnproto","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/capnproto?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.0-2.1ubuntu0.1~esm1"}]}],"versions":["1.1.0-2","1.1.0-2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.0-2.1ubuntu0.1~esm1","binary_name":"capnproto"},{"binary_name":"libcapnp-1.1.0","binary_version":"1.1.0-2.1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-32240.json"}}],"schema_version":"1.9.0","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"}]}