High severity · published Oct 22, 2026
CVE-2026-115505
libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum
New
7.6
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
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
Confidentiality
Low
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libsmb2 · sahlberg
before 6.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115505
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115505
github.com
https://github.com/sahlberg/libsmb2
github.com
https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff
github.com
https://github.com/sahlberg/libsmb2/issues/496
github.com
https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3
hackmd.io
https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oob
www.vulncheck.com
https://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum
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