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MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX

Type: advisorySource: Official CVE List1 source record

MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.

Announced Source revision 1
Original source ↗

CVE-2026-89028

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89028

RouterOS

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
      }
    ],
    "defaultStatus": "unknown"
  }
]
Related CVEs
CVE-2026-89028

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#5585 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement