Buffer overflow in Pgvector

CVE-2026-3172

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-3172: held from 0.003 to 0.006.

EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002

Affected products

  • Pgvector — versions 0.8.0, 0.7.0, 0.6.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-3172?
CVE-2026-3172 is a high-severity vulnerability in Pgvector, classified under Integer Underflow. CVSS score: 8.1/10. Published 2026-02-25.
How severe is CVE-2026-3172?
High severity. CVSS v3 base score is 8.1 out of 10.