{"id":"CVE-2026-32240","summary":"Cap'n Proto: Integer overflow in KJ-HTTP chunk size","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.","aliases":["GHSA-vpcq-mx5v-32wm"],"modified":"2026-04-10T05:42:21.845176Z","published":"2026-03-12T19:35:57.374Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32240.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-197","CWE-444"]},"references":[{"type":"WEB","url":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz"},{"type":"WEB","url":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32240.json"},{"type":"ADVISORY","url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32240"},{"type":"FIX","url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36"},{"type":"FIX","url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/capnproto/capnproto","events":[{"introduced":"0"},{"fixed":"8b892a8a11a632f5d52b877a49728808a142379a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32240.json"}}],"schema_version":"1.7.5","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"}]}