{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-32240","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-11T14:47:05.684Z","datePublished":"2026-03-12T19:35:57.374Z","dateUpdated":"2026-03-13T16:14:32.323Z"},"containers":{"cna":{"title":"Cap'n Proto: Integer overflow in KJ-HTTP chunk size","problemTypes":[{"descriptions":[{"cweId":"CWE-197","lang":"en","description":"CWE-197: Numeric Truncation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm"},{"name":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","tags":["x_refsource_MISC"],"url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36"},{"name":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","tags":["x_refsource_MISC"],"url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"},{"name":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz","tags":["x_refsource_MISC"],"url":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz"},{"name":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip","tags":["x_refsource_MISC"],"url":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip"}],"affected":[{"vendor":"capnproto","product":"capnproto","versions":[{"version":"< 1.4.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-03-12T19:35:57.374Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-vpcq-mx5v-32wm","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-13T16:14:24.863827Z","id":"CVE-2026-32240","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-13T16:14:32.323Z"}}]}}