{"id":"CVE-2026-32239","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-32239","generatedAt":"2026-10-28T02:17:55.598Z","title":"This vulnerability is fixed in 1.4.0.","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.","published":"2026-03-12T20:16:05.000Z","lastModified":"2026-06-17T10:35:24.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-190","CWE-444"],"affected":["capnproto/capnproto"],"epss":{"score":0.00215,"percentile":0.11838,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz","tags":["Product"],"source":"security-advisories@github.com"},{"url":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip","tags":["Product"],"source":"security-advisories@github.com"},{"url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-32239","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}