# CVE-2026-69618: Microsoft Windows SMB Client out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-69618-microsoft-windows-smb-client-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69618 · Severity: medium · CVSS 5.5 · Published 2026-09-08

Windows SMB Client is the component that allows a computer to connect to and access shared files and printers on network servers. An out-of-bounds read vulnerability allows an authorized user on the same system to read sensitive information from the computer's memory, potentially exposing passwords, keys, or other confidential data.

Technologies: [Microsoft Windows SMB Client](https://junglewise.ai/threats/technologies/windows-smb-client). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69618 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69618 being exploited in the wild.

**How severe is CVE-2026-69618?** Medium severity, with a CVSS score of 5.5, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows SMB Client.

**Is there a fix for CVE-2026-69618?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-69618 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-69618?** Check whether you run Microsoft Windows SMB Client. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is an out-of-bounds read flaw in the Windows SMB Client, a core networking component. The vulnerability requires local access and existing user privileges to trigger. An authorized attacker can exploit improper memory handling in SMB processing to read memory regions outside intended bounds, disclosing sensitive information from the host system. The vulnerability has a CVSS base score of 5.5 (medium severity). Patches are expected to be available from Microsoft.

## Affected products

- Microsoft Windows SMB Client

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69618](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69618)

## Related threats

- [Windows SMB Client privilege escalation via untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-119870-untrusted-pointer-dereference-in-windows-smb-client-allows-an)
- [Windows SMB Client heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-112971-heap-based-buffer-overflow-in-windows-smb-client-allows-an)
- [Microsoft Windows SMB Client use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-72936-microsoft-windows-smb-client-use-after-free-remote-code-execution)
- [Microsoft Windows SMB Client buffer over-read](https://junglewise.ai/threats/cve-2026-65794-microsoft-windows-smb-client-buffer-over-read)
- [Microsoft Windows SMB Client use after free privilege escalation](https://junglewise.ai/threats/cve-2026-40410-microsoft-windows-smb-client-use-after-free-privilege-escalation)