CVE-2026-115505 libsmb2 - Integer Overflow

libsmb2 < 6.3 contains an integer overflow caused by improper handling of wrapping actual_count or max_count values in DCE/RPC NDR decoder, letting malicious SMB servers or MITM corrupt heap memory, exploit requires unsigned SMB connections.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-190

Vendor fix

Update to version 6.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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