CVE-2026-110714

libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow

7.1 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.54%Unchanged since Oct 15, 2026

What each source reports

CVE List Score used 7.1

libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow

Record: CVE-2026-110714
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-02

EUVDEUVD-2026-101137 7.1

Record: EUVD-2026-101137
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-f7hf-m5cf-j6wv 7.1

libsmb2 through 6.2 contains an integer underflow vulnerability in decode_acl that allows...

Record: GHSA-f7hf-m5cf-j6wv
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-02

NVD 7.1

Record: CVE-2026-110714
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-02

OSV 7.1

libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow

Record: CVE-2026-110714
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-191
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-110714 7.1

Record: DEBIAN-CVE-2026-110714
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-110714 7.1

Record: UBUNTU-CVE-2026-110714
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

sahlberg libsmb2

Affected packages

Affected packages
Package	Affected	Fixed
`libsmb2` Debian:13	All versions, plus listed versions 6.2+dfsg-26.2+dfsg-2+deb13u16.2+dfsg-36.2+dfsg-4	None known
`libsmb2` Debian:14	All versions, plus listed versions 6.2+dfsg-26.2+dfsg-36.2+dfsg-4	None known
`libsmb2` Ubuntu:26.10	All versions, plus listed versions 6.2+dfsg-36.2+dfsg-4	None known
`libsmb2` Ubuntu:26.04:LTS	All versions, plus listed versions 6.2+dfsg-26.2+dfsg-3	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-110714 is a high vulnerability (CVSS 7.1) in Sahlberg Libsmb2, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. No source names a fixed version.

References

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