CVE-2026-110714: high-severity vulnerability in sahlberg libsmb2
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
Published · Updated
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.1epss 0.5%
exploitation probability
0.5%top 55% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
sahlberg · libsmb2public PoCs found — 1
cve_referencehackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-readunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — sahlberg libsmb2
In the same product, most dangerous first.
CVE-2026-110713HIGHlibsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info DecodersEPSS 0.5%CVE-2026-110712HIGHlibsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_infoEPSS 0.4%CVE-2026-115505HIGHlibsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnumEPSS 0.2%
References
https://github.com/sahlberg/libsmb2https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-readhttps://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow