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CVE-2026-115505

7.6 · 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.

Published Oct 22, 2026CWE-190EPSS 0.21%

Overview

CVE-2026-115505 is a high-severity vulnerability. It was published on October 22, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sahlberg/libsmb2GitHubgithub.com/sahlberg/libsmb2/commit/a79f6914cb5ed3f74293d15cdea901261ce179ffGitHubgithub.com/sahlberg/libsmb2/issues/496GitHubgithub.com/sahlberg/libsmb2/releases/tag/libsmb2-6.3Refhackmd.io/@haindpwn/libsmb2-dcerpc-ndr-count-overflow-oobRefwww.vulncheck.com/advisories/libsmb2-before-6.3-integer-overflow-in-dce-rpc-ndr-decoder-via-netrshareenum

How CyberStrike helps

Frequently asked questions

What is CVE-2026-115505?

CVE-2026-115505 is a high-severity vulnerability. It was published on October 22, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

How severe is CVE-2026-115505?

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-115505?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-115505?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-115505 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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