{"id":"CVE-2026-32239","state":"PUBLISHED","title":"Cap'n Proto has an integer overflow in KJ-HTTP","description":"Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.","publishedAt":"2026-03-12T19:33:25.052Z","updatedAt":"2026-03-13T16:15:03.051Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["capnproto capnproto"],"affected":[{"vendor":"capnproto","product":"capnproto","versions":[{"version":"< 1.4.0","status":"affected"}]}],"references":["https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm","https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","https://capnproto.org/capnproto-c++-1.4.0.tar.gz","https://capnproto.org/capnproto-c++-win32-1.4.0.zip"],"weaknesses":["CWE-444","CWE-190"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/32xxx/CVE-2026-32239.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-32239","state":"PUBLISHED","datePublished":"2026-03-12T19:33:25.052Z","dateUpdated":"2026-03-13T16:15:03.051Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-11T14:47:05.684Z"},"containers":{"cna":{"title":"Cap'n Proto has an integer overflow in KJ-HTTP","descriptions":[{"lang":"en","value":"Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0."}],"affected":[{"vendor":"capnproto","product":"capnproto","versions":[{"version":"< 1.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm","name":"https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","name":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","tags":["x_refsource_MISC"]},{"url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","name":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","tags":["x_refsource_MISC"]},{"url":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz","name":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz","tags":["x_refsource_MISC"]},{"url":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip","name":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-12T19:33:25.052Z"},"source":{"advisory":"GHSA-qjx3-pp3m-9jpm","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-13T16:14:56.683931Z","id":"CVE-2026-32239","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-13T16:15:03.051Z"}}]}}}