CVE-2026-115505

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.

CVSS v3.1 Score

7.6
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Published: 10/22/2026Modified: 10/29/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-115505 — libsmb2 before 6.3 contains integer overflow vulnerabilities in the DCE/RPC NDR ...

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.

CVE-2026-115505
NIST NVD

References (6)

https://github.com/sahlberg/libsmb2https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ffhttps://github.com/sahlberg/libsmb2/issues/496https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oobhttps://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum