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.
History

Tue, 10 Nov 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Sahlberg
Sahlberg libsmb2
Vendors & Products Sahlberg
Sahlberg libsmb2

Tue, 20 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-14T15:01:29.077Z

Updated: 2026-10-20T01:29:23.174Z

Reserved: 2026-10-14T14:39:52.603Z

Link: CVE-2026-110714

cve-icon Vulnrichment

Updated: 2026-10-20T01:29:19.063Z

cve-icon NVD

Status : Deferred

Published: 2026-10-14T16:17:43.473

Modified: 2026-10-20T02:17:10.497

Link: CVE-2026-110714

cve-icon Redhat

No data.