Heap Out-of-Bounds Read in libsmb2 Affects Multiple Clients
CVE-2026-110712

7.1HIGH

Key Information:

Vendor

Sahlberg

Status
Libsmb2
Vendor
CVE Published:
14 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-110712?

In libsmb2 version 6.2, a vulnerability exists that allows malicious SMB servers to exploit a flaw in the smb2_decode_file_all_info function. By sending a crafted FileAllInformation reply with an unchecked FileNameLength parameter, attackers can cause client crashes. This can occur when attackers control the server or perform man-in-the-middle attacks on unsigned sessions. This vulnerability poses a significant risk, as it affects the stability and reliability of clients utilizing the SMB protocol.

Affected Version(s)

libsmb2 0 <= 6.2

References

https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob...
technical-descriptionexploit
https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e49...
technical-description
https://github.com/sahlberg/libsmb2/commit/57bee9fb941a39...
patch

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

tonghuaroot
HaiND from the Post and Telecommunication Institute of Technology
.