CVE-2026-103484
Received Received - Intake

IVFFlat Index Build Out-of-Bounds Write in pgvector

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: PostgreSQL

Description
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.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-02
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103484
EUVD
EUVD-2026-91044

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
pgvector pgvector to 0.8.7 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
CWE-1284 The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

Attack-Flow Graph

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Executive Summary

This vulnerability is a buffer overflow in the pgvector extension's IVFFlat index build functionality. It allows a database user to write data out-of-bounds during index construction, which can lead to arbitrary code execution. The issue affects versions 0.8.6 and below.

Detection Guidance

To detect this vulnerability, check the version of pgvector installed on your PostgreSQL server. Run: SELECT extversion FROM pg_extension WHERE extname = 'vector'; If the version is 0.8.6 or below, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow an attacker with database access to execute arbitrary code, potentially leading to data breaches, system compromise, or unauthorized access to sensitive information stored in the database.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected pgvector versions may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Upgrade pgvector to version 0.8.7 or later immediately. Follow the official pgvector upgrade instructions for your PostgreSQL environment to ensure the buffer overflow vulnerability is patched.

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