High 7.6Published Oct 22, 2026

CVE-2026-115505libsmb2 before 6.3 Integer Overflow in DCE/RPC NDR Decoder via NetrShareEnum

Updated under an hour ago (Oct 28, 2026, 2:40 PM ET)

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It affects sahlberg libsmb2. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.21%, higher than 11% of scored CVEs.

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Every CVE for sahlberg libsmb2

Exploited in the last 30 days

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: 7.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.21% (percentile 11)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

sahlberg libsmb2 sahlberg:libsmb2 (from the name)	before 6.3	CNA record

References

References

https://hackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oob	technical-description, exploit
https://github.com/sahlberg/libsmb2/issues/496	issue-tracking
https://github.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ff	patch
https://github.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3	release-notes
https://github.com/sahlberg/libsmb2	product
https://www.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.