{"id":"CVE-2026-115505","state":"PUBLISHED","title":"libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum","description":"libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR decoder in lib/dcerpc.c that allow heap out-of-bounds reads and writes. A malicious SMB server or machine-in-the-middle on unsigned connections can send crafted NetrShareEnum replies with wrapping actual_count or max_count values when clients call smb2_share_enum_async(), corrupting heap memory.","publishedAt":"2026-10-22T19:14:05.297Z","updatedAt":"2026-10-29T12:22:44.734Z","severity":{"score":7.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["sahlberg libsmb2"],"affected":[{"vendor":"sahlberg","product":"libsmb2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"6.3","versionType":"custom"}],"collectionURL":"https://github.com/sahlberg/libsmb2","repo":"https://github.com/sahlberg/libsmb2"}],"references":["https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oob","https://github.com/sahlberg/libsmb2/issues/496","https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff","https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3","https://github.com/sahlberg/libsmb2","https://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115505.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115505","state":"PUBLISHED","datePublished":"2026-10-22T19:14:05.297Z","dateUpdated":"2026-10-29T12:22:44.734Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-22T16:14:59.116Z"},"containers":{"cna":{"title":"libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum","descriptions":[{"lang":"en","value":"libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR decoder in lib/dcerpc.c that allow heap out-of-bounds reads and writes. A malicious SMB server or machine-in-the-middle on unsigned connections can send crafted NetrShareEnum replies with wrapping actual_count or max_count values when clients call smb2_share_enum_async(), corrupting heap memory."}],"affected":[{"vendor":"sahlberg","product":"libsmb2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"6.3","versionType":"custom"}],"collectionURL":"https://github.com/sahlberg/libsmb2","repo":"https://github.com/sahlberg/libsmb2"}],"references":[{"url":"https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oob","tags":["technical-description","exploit"]},{"url":"https://github.com/sahlberg/libsmb2/issues/496","tags":["issue-tracking"]},{"url":"https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff","tags":["patch"]},{"url":"https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3","tags":["release-notes"],"name":"libsmb2 libsmb2-6.3 Release Notes"},{"url":"https://github.com/sahlberg/libsmb2","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum","name":"VulnCheck Advisory: libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"HIGH","baseScore":7.6,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-22T19:14:05.297Z"},"datePublic":"2026-10-21T00:00:00.000Z","credits":[{"lang":"en","value":"HaiND from the Post and Telecommunication Institute of Technology","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-29T12:22:30.404847Z","id":"CVE-2026-115505","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T12:22:44.734Z"}}]}}}