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CVE-2026-110713— libsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info Decoders

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 6.2 及更早版本存在堆越界读漏洞，漏洞出现在 和 函数中。该漏洞允许恶意的 SMB 服务器读取回复缓冲区之外的数据。控制服务器的攻击者，或者能够拦截未签名会话的攻击者，可以发送精心构造的 QUERY_INFO 回复，其中包含缺失或过大的名称长度，从而导致客户端崩溃。

CVSS 6.5 · Medium EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
sahlberg libsmb2 ≤ 6.2 affected
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I. Basic Information for CVE-2026-110713

Vulnerability Information
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Vulnerability Title
libsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info Decoders
Source: CVE Program / CVE List V5
Vulnerability Description
libsmb2 through 6.2 contains a heap out-of-bounds read vulnerability in smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info that allows malicious SMB servers to read past reply buffers. Attackers controlling a server or intercepting unsigned sessions can send crafted QUERY_INFO replies with missing or oversized name lengths to crash 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
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-110713

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III. Intelligence Information for CVE-2026-110713

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Patches & Fixes for CVE-2026-110713 (1)

Other References for CVE-2026-110713 (3)

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

CVE-2026-110714 6.5 MEDIUM libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
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-125

V. Comments for CVE-2026-110713

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