Integer overflow in Sahlberg Libsmb2
CVE-2026-110714
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.
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read (technical-description, exploit)
- github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/s… (technical-description)
- github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450 (patch)
- github.com/sahlberg/libsmb2 (product)
- www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-de… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110714?
- CVE-2026-110714 is a medium-severity vulnerability in Sahlberg Libsmb2, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-10-14.
- How severe is CVE-2026-110714?
- Medium severity. CVSS v3 base score is 6.5 out of 10.