CVE-2026-110714
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | sahlberg |
| Product | libsmb2 |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
sahlberg / libsmb2
0 โค 6.2
References
hackmd.io: https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read github.com: https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266 github.com: https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450 github.com: https://github.com/sahlberg/libsmb2 vulncheck.com: https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow
Credits
้ไฝณ็ฟฐ HaiND from the Post and Telecommunication Institute of Technology