{"id":"UBUNTU-CVE-2026-110714","details":"libsmb2 through 6.2 contains an integer underflow vulnerability in decode_acl that allows malicious SMB servers to trigger heap out-of-bounds reads via crafted security descriptors. Attackers controlling a server or intercepting unsigned sessions can send an AclSize below 8 in a QUERY_INFO reply, bypassing ACE bounds checks and crashing the client.","modified":"2026-10-17T12:58:03.511427605Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-110714"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-110714"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-110714"},{"type":"REPORT","url":"https://github.com/sahlberg/libsmb2"},{"type":"REPORT","url":"https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266"},{"type":"REPORT","url":"https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450"},{"type":"REPORT","url":"https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow"}],"affected":[{"package":{"name":"libsmb2","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libsmb2?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2+dfsg-3","6.2+dfsg-4"],"ecosystem_specific":{"binaries":[{"binary_version":"6.2+dfsg-4","binary_name":"libsmb2-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110714.json"}},{"package":{"name":"libsmb2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libsmb2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2+dfsg-2","6.2+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_version":"6.2+dfsg-3","binary_name":"libsmb2-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110714.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}