CVE-2026-110714
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
sahlberg libsmb2
CVSS
7.1HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 20 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.55%Chance of exploitation activity in the next 30 days, higher than 44% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- libsmb2affected: all versions through 6.2CVE List
References 5
- github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450Fixvia CVE List
- github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266Advisoryvia CVE List
- vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflowAdvisoryvia CVE List
- hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-readExploitvia CVE List
- github.com/sahlberg/libsmb2Referencevia CVE List