{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-121727","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-11-03T22:17:02.851Z","datePublished":"2026-11-03T22:55:33.948Z","dateUpdated":"2026-11-03T22:55:33.948Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-11-03T22:55:33.948Z"},"datePublic":"2026-09-02T00:00:00.000Z","title":"Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Integer Underflow (Wrap or Wraparound)","cweId":"CWE-191","type":"CWE"}]}],"affected":[{"vendor":"jorisvink","product":"kore","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"4.3.0","status":"affected","versionType":"semver"}],"packageURL":"pkg:github/jorisvink/kore"}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/jorisvink/kore","tags":["product"]},{"url":"https://kore.io/releases/4.3.0","tags":["release-notes"],"name":"Kore 4.3.0 Release Notes"},{"url":"https://github.com/jorisvink/kore/blob/4.3.0-rc5/src/http.c#L934","tags":["technical-description"]},{"name":"VulnCheck Advisory: Kore before 4.3.0 Integer Underflow Memory Exhaustion via http_header_recv()","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/kore-before-4.3.0-integer-underflow-memory-exhaustion-via-http-header-recv"}],"credits":[{"lang":"en","value":"Tristan Madani","type":"finder"},{"lang":"en","value":"Joris Vink","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}