Vulnerability · Published Feb 25, 2026 · Assigned by PostgreSQL
CVE-2026-3172pgvector buffer overflow in parallel HNSW index build
High 8.1
In plain English
A high-severity out-of-bounds write in pgvector. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.4%top 67.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | pgvector | no fix listed | DEBIAN-CVE-2026-3172 |
| Debian:14 | pgvector | 0.8.2-1 | DEBIAN-CVE-2026-3172 |
| Ubuntu:24.04:LTS | pgvector | no fix listed | UBUNTU-CVE-2026-3172 |
| Ubuntu:25.10 | pgvector | no fix listed | UBUNTU-CVE-2026-3172 |
| Ubuntu:26.04:LTS | pgvector | no fix listed | UBUNTU-CVE-2026-3172 |
| Ubuntu:26.10 | pgvector | no fix listed | UBUNTU-CVE-2026-3172 |
Affected products (as reported)
Weakness: CWE-191, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H