CVE-2026-103484: pgvector buffer overflow in IVFFlat index build
Vulnerability summary
CVE-2026-103484 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in pgvector. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 36.6% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 01-10-2026PublishedVulnerability first disclosed.
- 01-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · Red hatEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.42% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
- CWE-1284Improper Validation of Specified Quantity in InputThe 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.
Affected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat49 products
- pg_repack< 0:1.5.1-1.module+el9.8.0+24090+8f0ee565 | < 0:1.5.3-1.module+el9.8.0+23739+1c42644c
- pg_repack-debuginfo< 0:1.5.1-1.module+el9.8.0+24090+8f0ee565 | < 0:1.5.3-1.module+el9.8.0+23739+1c42644c
- pg_repack-debugsource< 0:1.5.1-1.module+el9.8.0+24090+8f0ee565 | < 0:1.5.3-1.module+el9.8.0+23739+1c42644c
- pgaudit< 0:16.0-1.module+el9.8.0+24090+8f0ee565 | < 0:18.0-1.module+el9.8.0+23739+1c42644c
- pgaudit-debuginfo< 0:16.0-1.module+el9.8.0+24090+8f0ee565 | < 0:18.0-1.module+el9.8.0+23739+1c42644c
Suse26 products
- pgvector&distro=SUSE Linux Enterprise Module for Server Applications 15 SP7< 0.8.7-150600.13.12.1
- pgvector&distro=SUSE Linux Enterprise Server 15 SP6-LTSS< 0.8.7-150600.13.12.1
- pgvector&distro=SUSE Linux Enterprise Server 16.0< 0.8.7-160000.1.1
- pgvector&distro=SUSE Linux Enterprise Server for SAP Applications 15 SP6< 0.8.7-150600.13.12.1
- pgvector&distro=SUSE Linux Enterprise Server for SAP applications 16.0< 0.8.7-160000.1.1
Opensuse8 products
- pgvector&distro=openSUSE Leap 16.0< 0.8.7-160000.1.1
- pgvector&distro=openSUSE Tumbleweed< 0.8.7-1.1
- postgresql13-pgvector&distro=openSUSE Leap 16.0< 0.8.7-160000.1.1
- postgresql14-pgvector&distro=openSUSE Leap 16.0< 0.8.7-160000.1.1
- postgresql15-pgvector&distro=openSUSE Leap 16.0< 0.8.7-160000.1.1
Debian1 product
- pgvectorAll versions (No fix recorded) | < 0.8.7-1
Ubuntu1 product
- pgvectorAll versions (No fix recorded)
5 vendors · 85 products
