libsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_info
Published Oct 14, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
libsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_info
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
libsmb2 through 6.2 contains a heap out-of-bounds read vulnerability in smb2_decode_file_all_info that allows malicious SMB servers to crash clients by sending an unchecked FileNameLength. Attackers controlling the server or performing man-in-the-middle on unsigned sessions can return crafted FileAllInformation replies to smb2_stat or smb2_fstat calls, crashing the client.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- hackmd.io ↗
- Source repository ↗
- Patch commit ↗
- Source repository ↗
- VulnCheck Advisory: libsmb2 through 6.2 Heap Out-of-Bounds Read via smb2_decode_file_all_info ↗
Record history
Published Oct 14, 2026 · Last refreshed Nov 3, 2026