Medium severity · published Oct 14, 2026
CVE-2026-110714
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libsmb2 · sahlberg
through 6.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110714
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110714
technical-description
https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read
technical-description
https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266
patch
https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450
product
https://github.com/sahlberg/libsmb2
third-party-advisory
https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow
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