How severe is CVE-2026-3172?

CVE-2026-3172 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-3172 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3172?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3172 have an EU (EUVD) identifier?

Yes. CVE-2026-3172 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8743.

When was CVE-2026-3172 published?

CVE-2026-3172 was published on 2026-02-25 and last updated on 2026-06-17.

CVE-2026-3172

CVE-2026-3172 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8743
Weakness: CWE-191
Published: 2026-02-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3172?: CVE-2026-3172 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-3172 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3172?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3172 have an EU (EUVD) identifier?: Yes. CVE-2026-3172 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8743.
When was CVE-2026-3172 published?: CVE-2026-3172 was published on 2026-02-25 and last updated on 2026-06-17.

References

https://github.com/pgvector/pgvector/issues/959

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