{"id":"JLSEC-2026-1269","details":"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.","modified":"2026-08-12T20:00:03.477569630Z","published":"2026-08-12T19:53:38.652Z","upstream":["CVE-2026-32239","EUVD-2026-11687"],"database_specific":{"sources":[{"imported":"2026-08-12T15:05:32.487Z","modified":"2026-06-17T10:35:24.370Z","published":"2026-03-12T20:16:05.010Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-32239","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32239","database_specific":{"status":"Analyzed"},"id":"CVE-2026-32239"},{"modified":"2026-03-13T16:15:03Z","published":"2026-03-12T19:33:25Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-11687","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-11687","id":"EUVD-2026-11687","imported":"2026-08-12T15:05:33.812Z"}],"license":"CC-BY-4.0"},"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":"WEB","url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36"},{"type":"WEB","url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"},{"type":"WEB","url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm"}],"affected":[{"package":{"name":"capnproto_jll","ecosystem":"Julia","purl":"pkg:julia/capnproto_jll?uuid=3576fdfd-e245-5854-bcf7-dae6dc3117e0"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1269.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}