CVE-2026-3172

pgvector buffer overflow in parallel HNSW index build

State: Published
Severity: 8.1 High
Published: Feb 25, 2026
Updated: Feb 26, 2026
Reserved: Feb 24, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	PostgreSQL

Weaknesses

CWE-191 Integer Underflow or Wraparound
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
pgvectorn/a	0.8.0 to before 0.8.2Affected 0.7.0Affected 0.6.0Affected

References

https://github.com/pgvector/pgvector/issues/959

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