{"id":"CVE-2026-111137","title":"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","summary":"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 …","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cwe":["CWE-787"],"vendor":"amartin755","product":"libsmi","affected":["libsmi <= 0.5.0"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:27.690","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111137","references":[{"url":"https://github.com/amartin755/libsmi","label":"disclosure@vulncheck.com"},{"url":"https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T19:25:46.410Z","slug":"CVE-2026-111137","body":"## Overview\n\nlibsmi 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}