{"id":"CVE-2026-111137","state":"PUBLISHED","title":"libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL","description":"libsmi through 0.5.0 contains an out-of-bounds write vulnerability in smiValueAsString() in lib/smi.c that allows attackers to overflow a fixed 1024-byte static buffer through hex rendering of OCTET STRING values. Attackers can supply a crafted MIB with an OCTET STRING DEFVAL of 512 or more octets and a leading 0x00 byte to corrupt adjacent library globals and crash smidump or other consumers.","publishedAt":"2026-10-15T18:57:30.581Z","updatedAt":"2026-10-16T17:10:45.000Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["amartin755 libsmi"],"affected":[{"vendor":"amartin755","product":"libsmi","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.5.0","versionType":"custom"}],"collectionURL":"https://github.com/amartin755/libsmi","repo":"https://github.com/amartin755/libsmi"}],"references":["https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write","https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566","https://github.com/amartin755/libsmi","https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/111xxx/CVE-2026-111137.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-111137","state":"PUBLISHED","datePublished":"2026-10-15T18:57:30.581Z","dateUpdated":"2026-10-16T17:10:45.000Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-15T17:03:55.430Z"},"containers":{"cna":{"title":"libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL","descriptions":[{"lang":"en","value":"libsmi through 0.5.0 contains an out-of-bounds write vulnerability in smiValueAsString() in lib/smi.c that allows attackers to overflow a fixed 1024-byte static buffer through hex rendering of OCTET STRING values. 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