Buffer overflow in parallel HNSW index build in pgvector 0.6.0 through 0.8.1 allows a database user to leak sensitive data from other relations or crash the database server.
Date: 2026-02
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-3172
CWE: CWE-191
CWE-787
CVSS: 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)

Buffer overflow in parallel HNSW index build in pgvector 0.6.0 through 0.8.1 allows a database user to leak sensitive data from other relations or crash the database server.


Mitigations:

Architectural layers (MAESTRO):