Arbitrary code execution via unchecked IVFFlat sizing
Published Jul 29, 2026 · Updated Jul 29, 2026
Integer wraparound in pgvector before 0.8.6 allows remote authenticated users to execute arbitrary code during IVFFlat index creation. ElkanKmeans multiplies and sums attacker-influenced allocation dimensions without overflow checks, underallocating buffers used by clustering writes. Exploitation requires permission to create an IVFFlat index on a 32-bit PostgreSQL host; 64-bit systems are not affected.
Summary
What happened
Integer wraparound in pgvector before 0.8.6 allows remote authenticated users to execute arbitrary code during IVFFlat index creation. ElkanKmeans multiplies and sums attacker-influenced allocation dimensions without overflow checks, underallocating buffers used by clustering writes. Exploitation requires permission to create an IVFFlat index on a 32-bit PostgreSQL host; 64-bit systems are not affected.
The record
- CVE
- CVE-2026-18022
- Published
- Jul 29, 2026
- Updated
- Jul 29, 2026
- Vendor
- pgvector
- Product
- pgvector
- Classifications
- CWE-190, CWE-787, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 29, 2026CVE publishedPublication date reported by the CVE source.
- Jul 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.8.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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