Buffer overflow in Pgvector

CVE-2026-103484

IVFFlat index build in pgvector before 0.8.7 allows a database user to write data out-of-bounds, which can lead to arbitrary code execution.

Vulnerability class: Buffer Overflow

Published 2026-10-01.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Pgvector

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-103484?: CVE-2026-103484 is a high-severity vulnerability in Pgvector, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-10-01.
How severe is CVE-2026-103484?: High severity. CVSS v3 base score is 8.8 out of 10.