OverlayBD LSMT index size integer overflow causes out-of-bounds heap access

Finding IDs

F-OVERLAYBD-001-002

CVE

CVE-2026-107446

Status

fixed in public code; release unconfirmed

Fixed in

Public code fix merged; fixed release not independently confirmed

Reported date

5 Mar 2026

Note

CVE published on 8 October 2026 for containerd overlaybd through 1.0.18: integer overflow in do_load_index when loading LSMT index metadata can cause out-of-bounds heap access when an untrusted registry blob is used with multiple overlaybd-backed containers. This is the existing researcher report F-OVERLAYBD-001-002, not an additional finding. The CVE references public index-size validation PR #438, merged on 18 August 2026. A fixed release has not been independently confirmed. The public CVE record does not include a reporter credit; the report mapping is researcher-confirmed, and the vendor patch is not attributed to 1seal.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

CVE registry state

PUBLISHED

CVE state checked

8 Oct 2026

CVSS assessment

MITRE CVE record; v3.1; 6.8; observed 2026-10-08

F-OVERLAYBD-001-002: Memory safety. Untrusted LSMT index metadata can overflow index_bytes and cause out-of-bounds heap access. Reviewed 8 Oct 2026. Mechanism assessed by 1seal.

Mechanism source for F-OVERLAYBD-001-002

Security area (1seal assessment): Memory safety. Untrusted LSMT index metadata can overflow index_bytes and cause out-of-bounds heap access. Reviewed 8 Oct 2026.

• Source: raw.githubusercontent.com (external) ↗
• F-OVERLAYBD-001-002
• CVE publication state
• CVSS assessment source
• Public index-size validation PR
• CVE-referenced public commit
• CVE-2026-107446 CNA record
• Classification source