CVE-2026-110714CWE-191

CVE-2026-110714

Medium · published October 14, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · 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
EPSS
0.00545 · 45.0th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-10-14T20:17Z
References (5)
https://github.com/sahlberg/libsmb2 · [email protected]https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-security-descriptor.c#L266 · [email protected]https://github.com/sahlberg/libsmb2/commit/523abe20be3207011a936db47f1d3bab79c05450 · [email protected]https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read · [email protected]https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-decode-acl-integer-underflow · [email protected]
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 1%
    epss
  • 14 OCT 15:01Z
    libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
    cvelistv5
  • 14 OCT 15:01Z
    libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
    cvelistv5