{"id":"CVE-2026-121727","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-121727","summary":"Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes…","details":"Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes than declared. Attackers can send oversized first segments over many concurrent POST, PUT or DELETE connections, wrapping content_length to grow buffers unbounded and exhaust worker memory.","published":"2026-11-03T23:17:36.043","modified":"2026-11-03T23:17:36.043","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b","label":"jorisvink/kore@1ff3c0f"},"references":[{"type":"WEB","url":"https://github.com/jorisvink/kore"},{"type":"WEB","url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934"},{"type":"WEB","url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b"},{"type":"WEB","url":"https://kore.io/releases/4.3.0"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-11-03T23:17:36.043"}}