{"id":"CVE-2026-121727","published":"2026-11-03T23:17:36.043","lastModified":"2026-11-03T23:17:36.043","description":"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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-191"],"vendors":[],"products":[],"references":[{"url":"https://github.com/jorisvink/kore","tags":[]},{"url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934","tags":[]},{"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b","tags":[]},{"url":"https://kore.io/releases/4.3.0","tags":[]},{"url":"https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv","tags":[]}],"exploitRefs":[{"url":"https://github.com/jorisvink/kore","tags":[]},{"url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934","tags":[]},{"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b","tags":[]}],"hasPoc":true,"ai":null}