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CVE-2026-110714— libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow

Quick assessment

Affected
sahlberg libsmb2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libsmb2 版本 6.2 及之前版本在 函数中存在一个整数下溢漏洞。该漏洞允许恶意的 SMB 服务器通过构造的访问控制描述符（security descriptors）触发堆越界读取攻击。攻击者若控制一台 SMB 服务器，或能够拦截未签名的 SMB 会话，便可在 QUERY_INFO 响应中发送小于 8 的 AclSize 值，从而绕过 ACE（访问控制条目）的边界检查，导致客户端崩溃。

CVSS 6.5 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
sahlberg libsmb2 ≤ 6.2 affected
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I. Basic Information for CVE-2026-110714

Vulnerability Information
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Vulnerability Title
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sahlberg libsmb2 0 ~ 6.2 -

II. Public POCs for CVE-2026-110714

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III. Intelligence Information for CVE-2026-110714

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Patches & Fixes for CVE-2026-110714 (1)

Other References for CVE-2026-110714 (3)

Same Patch Batch · sahlberg · 2026-10-14 · 3 CVEs total

CVE-2026-110713 6.5 MEDIUM libsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info Decoders
CVE-2026-110712 6.5 MEDIUM libsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_info

IV. Related Vulnerabilities

Same product: libsmb2
Same vendor: sahlberg
Same weakness: CWE-191

V. Comments for CVE-2026-110714

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