CVE-2026-115505

High

Description

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.

SeverityHigh

CVSS7.6

Exploit probability11. percentile0.2%

ProductSahlberg Libsmb2

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-190Integer overflow

How to fix

Update

sahlberg libsmb26.3 or later

Patches

github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff

Vendor advisories

github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3

Affected products

Product	Affected versions	Fixed in
sahlberg libsmb2	v < 6.3	6.3

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