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CVE-2026-56719

MikroTik RouterOS < 7.24 Out-of-Bounds Read via SMB1 SessionSetupAndX

CVSS 4.0 6.3 MEDIUMCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-56719

Published

MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-56719

Published

RouterOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unknown",
                    "vendor": "MikroTik",
                    "product": "RouterOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver",
                            "lessThanOrEqual": "6.49.18"
                        },
                        {
                            "status": "affected",
                            "version": "7.0.0",
                            "versionType": "semver",
                            "lessThanOrEqual": "7.11.2"
                        },
                        {
                            "status": "unaffected",
                            "version": "7.24.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON