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TI-2026-21229 Aliases CVE-2026-26240GHSA-872q-mhr9-36mh

Stack-based buffer overflow in QNAP File Station 5

Priority LOW 14CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A buffer overflow vulnerability has been reported to affect File Station 5. The remote attackers can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5243 and later

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00442 38th percentileScored 2026-11-07
Fix Fixed File Station 5 (QNAP Systems Inc.): 5.5.6.5243

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QNAPFile Station 55.5.0 to before 5.5.6.52435.5.6.5243Patch availableCNA
  • File Station 5 VendorQNAP Affected 5.5.0 to before 5.5.6.5243 Fixed in 5.5.6.5243 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:*5.5.6.4691 to before 5.5.6.5243VulnerableQNAP
  • cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:* Versions 5.5.6.4691 to before 5.5.6.5243 Vulnerable ·QNAP

Remediation

  • Fix · CNA File Station 5 (QNAP Systems Inc.) Fixed in 5.5.6.5243

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    QNAP Systems File Station 5 5.5.6.5243

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-19932 Incorrect authorization in QNAP File Station 5Priority LOW 34
    • TI-2026-21230 Stack-based buffer overflow in QNAP File Station 5Priority LOW 14
    • TI-2026-19931 Resource allocation without limits in QNAP File Station 5Priority LOW 8
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26240
  2. 2026-10-03 Alias added: GHSA-872q-mhr9-36mh

References

Other 1

  • TI-2025-24025 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21598 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21273 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21272 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21271 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2026-19932 Incorrect authorization in QNAP File Station 5 CVSS 4.0MEDIUM 6.2
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences