CVE-2026-110714
libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
- State
- Published
- Severity
- 7.1 High
- Published
- Oct 14, 2026
- Updated
- Oct 20, 2026
- Reserved
- Oct 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | 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 | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-191 Integer Underflow (Wrap or Wraparound)
Affected Products
| Product | Versions |
|---|---|
libsmb2sahlberg |
|
References
- https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-readtechnical-descriptionexploit
- https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266technical-description
- https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450patch
- https://github.com/sahlberg/libsmb2product
- VulnCheck Advisory: libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflowthird-party-advisory
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