{"id":"UBUNTU-CVE-2026-111137","details":"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.","modified":"2026-10-17T12:58:03.999262054Z","published":"2026-10-16T00:00:00Z","upstream":["CVE-2026-111137"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-111137"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-111137"},{"type":"REPORT","url":"https://github.com/amartin755/libsmi"},{"type":"REPORT","url":"https://github.com/amartin755/libsmi/blob/c58307210fe995ec419db976eb234aebc71a9216/lib/smi.c#L479-L566"},{"type":"REPORT","url":"https://hackmd.io/@haind-pwn/libsmi-smivalueasstring-octetstring-defval-oob-write"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libsmi-through-0.5.0-out-of-bounds-write-via-smivalueasstring-octet-string-defval"}],"affected":[{"package":{"name":"libsmi","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-9ubuntu3","0.4.8+dfsg2-11"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-11"},{"binary_version":"0.4.8+dfsg2-11","binary_name":"libsmi2ldbl"},{"binary_version":"0.4.8+dfsg2-11","binary_name":"smistrip"},{"binary_version":"0.4.8+dfsg2-11","binary_name":"smitools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-15"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-15"},{"binary_name":"libsmi2ldbl","binary_version":"0.4.8+dfsg2-15"},{"binary_version":"0.4.8+dfsg2-15","binary_name":"smistrip"},{"binary_name":"smitools","binary_version":"0.4.8+dfsg2-15"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-16"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-16"},{"binary_version":"0.4.8+dfsg2-16","binary_name":"libsmi2ldbl"},{"binary_name":"smistrip","binary_version":"0.4.8+dfsg2-16"},{"binary_name":"smitools","binary_version":"0.4.8+dfsg2-16"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-16"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4.8+dfsg2-16","binary_name":"libsmi2-common"},{"binary_version":"0.4.8+dfsg2-16","binary_name":"libsmi2ldbl"},{"binary_name":"smistrip","binary_version":"0.4.8+dfsg2-16"},{"binary_name":"smitools","binary_version":"0.4.8+dfsg2-16"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-16","0.4.8+dfsg2-16.1","0.4.8+dfsg2-16.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-16.1build1"},{"binary_version":"0.4.8+dfsg2-16.1build1","binary_name":"libsmi2t64"},{"binary_name":"smistrip","binary_version":"0.4.8+dfsg2-16.1build1"},{"binary_name":"smitools","binary_version":"0.4.8+dfsg2-16.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-18"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-18"},{"binary_name":"libsmi2t64","binary_version":"0.4.8+dfsg2-18"},{"binary_version":"0.4.8+dfsg2-18","binary_name":"smistrip"},{"binary_name":"smitools","binary_version":"0.4.8+dfsg2-18"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}},{"package":{"name":"libsmi","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libsmi?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8+dfsg2-17","0.4.8+dfsg2-18"],"ecosystem_specific":{"binaries":[{"binary_name":"libsmi2-common","binary_version":"0.4.8+dfsg2-18"},{"binary_name":"libsmi2t64","binary_version":"0.4.8+dfsg2-18"},{"binary_version":"0.4.8+dfsg2-18","binary_name":"smistrip"},{"binary_version":"0.4.8+dfsg2-18","binary_name":"smitools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111137.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"},{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}