CVE-2026-115505

libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum

7.2 High

libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR decoder in lib/dcerpc.c that allow heap out-of-bounds reads and writes. A malicious SMB server or machine-in-the-middle on unsigned connections can send crafted NetrShareEnum replies with wrapping actual_count or max_count values when clients call smb2_share_enum_async(), corrupting heap memory.

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: Low
Integrity: Low
Availability: High

Exploit likelihood

0.21%Unchanged since Oct 23, 2026

What each source reports

CVE List Score used 7.2

libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum

Record: CVE-2026-115505
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-190
Updated: 2026-11-02

EUVDEUVD-2026-108337 7.2

Record: EUVD-2026-108337
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-jfx5-c9g5-vf27 7.2

libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR decoder in lib...

Record: GHSA-jfx5-c9g5-vf27
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-190
Updated: 2026-11-02

NVD 7.2

Record: CVE-2026-115505
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-190
Updated: 2026-11-02

OSV 7.2

libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum

Record: CVE-2026-115505
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-190
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-115505 7.2

Record: DEBIAN-CVE-2026-115505
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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-2026-115505 7.2

Record: UBUNTU-CVE-2026-115505
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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-2026-115505 is a high vulnerability (CVSS 7.2) in Sahlberg Libsmb2, published October 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. No source names a fixed version.

References

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