---
id: CVE-2026-115505
title: libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum
summary: >-
  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
  craf…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-190
vendor: sahlberg
product: libsmb2
affected:
  - libsmb2 < 6.3
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:14:05.297Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115505'
references:
  - url: 'https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oob'
  - url: 'https://github.com/sahlberg/libsmb2/issues/496'
  - url: >-
      https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff
  - url: 'https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3'
    label: libsmb2 libsmb2-6.3 Release Notes
  - url: 'https://github.com/sahlberg/libsmb2'
  - url: >-
      https://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum
    label: >-
      VulnCheck Advisory: libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR
      Decoder via NetrShareEnum
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.413Z'
---

## Overview

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.

## Affected

- `libsmb2 < 6.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.