{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"jorisvink/kore","product":"kore","source":"CNA: VulnCheck","vendor":"jorisvink","versions":[{"lessThan":"4.3.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-121727","cwes":["CWE-191"],"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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","version":"4.0"},{"score":7.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793747856043,"publishedAt":1793746533948,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/jorisvink/kore"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://kore.io/releases/4.3.0"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jorisvink/kore"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://kore.io/releases/4.3.0"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b"}],"revision":"70be94c2d957d78caed64fa04b6b2ae57c86f4908539c2cce3362b63e9749148","sources":[{"modifiedAt":1793746533948,"name":"CNA: VulnCheck","retrievedAt":1793748229383,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121727"},{"modifiedAt":1793747856043,"name":"NVD","retrievedAt":1793751780626,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121727"}],"ssvc":null,"status":"published","title":"Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()","updatedAt":1793751780626}