CVE-2026-110714
CVE-2026-110714 · libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 7.1 · High · EPSS 0.5%
- Published
- Updated
Stack: system
Affected products and versions
libsmb2
- Versions
- ≥ 0, ≤ 6.2: Affected (custom)
No fix published
libsmb2 Debian:13
- Versions
- 6.2+dfsg-2
- 6.2+dfsg-2+deb13u1
- 6.2+dfsg-3
- 6.2+dfsg-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsmb2 Debian:14
- Versions
- 6.2+dfsg-2
- 6.2+dfsg-3
- 6.2+dfsg-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsmb2 Ubuntu:26.10
- Versions
- 6.2+dfsg-3
- 6.2+dfsg-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsmb2 Ubuntu:26.04:LTS
- Versions
- 6.2+dfsg-2
- 6.2+dfsg-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read
- https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266
- https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450
- https://github.com/sahlberg/libsmb2
- https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow
- https://nvd.nist.gov/vuln/detail/CVE-2026-110714