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Fencer Intel
high 8.8

CVE-2026-103484 json

pgvector buffer overflow in IVFFlat index build

published last mo. modified last mo. also EUVD-2026-91044

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

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.

Patch / fix

  • n/a pgvector 0.8.7
  • pgvector Debian 14 0.8.7-1

debian advisories DEBIAN-CVE-2026-103484

  • pgaudit RHEL 9 18.0-1.module+el9.8.0+23739+1c42644c
  • postgis RHEL 9 3.6.1-4.module+el9.8.0+24879+1364ef12
  • pgvector RHEL 9 0.8.7-1.module+el9.8.0+25065+515b563e
  • pg_repack RHEL 9 1.5.3-1.module+el9.8.0+23739+1c42644c
  • postgresql RHEL 9 18.6-1.module+el9.8.0+24816+5c11f535
  • postgis-utils RHEL 9 3.6.1-4.module+el9.8.0+24879+1364ef12
  • postgis-client RHEL 9 3.6.1-4.module+el9.8.0+24879+1364ef12
  • postgis-upgrade RHEL 9 3.6.1-4.module+el9.8.0+24879+1364ef12

red hat advisories RHSA-2026:85814RHSA-2026:85791

  • pgvector SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP7 0.8.7-150600.13.12.1
  • postgresql16-pgvector SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP7 0.8.7-150600.13.12.1
  • postgresql17-pgvector SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP7 0.8.7-150600.13.12.1
  • postgresql18-pgvector SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP7 0.8.7-150600.13.12.1
  • pgvector SLES for SAP applications 16.0, SLES 16.0 0.8.7-160000.1.1
  • postgresql13-pgvector SLES for SAP applications 16.0, SLES 16.0 0.8.7-160000.1.1
  • postgresql14-pgvector SLES for SAP applications 16.0, SLES 16.0 0.8.7-160000.1.1
  • postgresql15-pgvector SLES for SAP applications 16.0, SLES 16.0 0.8.7-160000.1.1

suse advisories SUSE-SU-2026:4804-1SUSE-SU-2026:24211-1

  • pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql13-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql14-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql15-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql16-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql17-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • postgresql18-pgvector openSUSE Leap 16.0 0.8.7-160000.1.1
  • pgvector openSUSE Tumbleweed 0.8.7-1.1

opensuse advisories openSUSE-SU-2026:22065-1openSUSE-SU-2026:12067-1

  • pgvector AlmaLinux 10 0.8.7-1.el10_2
  • postgresql18-pgvector AlmaLinux 10 0.8.7-1.el10_2
  • pgaudit AlmaLinux 9 16.0-1.module_el9.4.0+66+eb9878bc
  • postgis AlmaLinux 9 3.5.3-6.module_el9.8.0+311+c39b793b
  • pgvector AlmaLinux 9 0.8.7-1.module_el9.8.0+324+0cb93d9d
  • pg_repack AlmaLinux 9 1.5.1-1.module_el9.6.0+146+c54fdeca
  • postgresql AlmaLinux 9 16.15-1.module_el9.8.0+311+c39b793b
  • postgis-utils AlmaLinux 9 3.5.3-6.module_el9.8.0+311+c39b793b

almalinux advisories ALSA-2026:88359ALSA-2026:88360ALSA-2026:85791ALSA-2026:85814

  • postgresql16-pgvector Rocky Linux 10 0.8.7-1.el10_2
  • postgresql18-pgvector Rocky Linux 10 0.8.7-1.el10_2
  • pgaudit Rocky Linux 9 16.0-1.module+el9.8.0+40212+d6f50005
  • pgaudit Rocky Linux 9 16.0-1.module+el9.8.0+40159+adcaa225
  • postgis Rocky Linux 9 3.5.3-6.module+el9.8.0+40320+f6f9ed3c
  • pg_repack Rocky Linux 9 1.5.1-1.module+el9.8.0+40212+d6f50005
  • pg_repack Rocky Linux 9 1.5.1-1.module+el9.8.0+40159+adcaa225
  • postgresql Rocky Linux 9 16.15-1.module+el9.8.0+40320+f6f9ed3c

rocky linux advisories RLSA-2026:88359RLSA-2026:88360RLSA-2026:85791RLSA-2026:85814

Is CVE-2026-103484 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-103484 updated cvss 8.8

pgvector: pgvector: Arbitrary code execution via out-of-bounds write during IVFFlat index build

  • Red Hat Enterprise Linux AppStream (v. 9) pgaudit 16.0-1.module+el9.8.0+24090+8f0ee565, pgaudit 18.0-1.module+el9.8.0+23739+1c42644c, postgis 3.5.3-6.module+el9.8.0+24839+3a67b9ca, postgis 3.6.1-4.module+el9.8.0+24879+1364ef12, pgvector 0.8.7-1.module+el9.8.0+25064+c8e71655, pgvector 0.8.7-1.module+el9.8.0+25065+515b563e, +30 more
    fixed: vendor fix “Restrict schema creation permissions to prevent untrusted database accounts from building indexes, or remove the optional pgvector package if vector indexing is not needed.” RHSA-2026:85791
  • Red Hat Enterprise Linux AppStream (v. 10) pgvector 0.8.7-1.el10_2, postgresql16-pgvector 0.8.7-1.el10_2, postgresql18-pgvector 0.8.7-1.el10_2
    fixed: vendor fix “Restrict schema creation permissions to prevent untrusted database accounts from building indexes, or remove the optional pgvector package if vector indexing is not needed.” RHSA-2026:88359
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) pgvector 0.8.7-1.el10_0, postgresql16-pgvector 0.8.7-1.el10_0
    fixed: vendor fix “Restrict schema creation permissions to prevent untrusted database accounts from building indexes, or remove the optional pgvector package if vector indexing is not needed.” RHSA-2026:95521
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) pgaudit 16.0-1.module+el9.4.0+20427+07482b8c, pgvector 0.8.7-1.module+el9.6.0+25207+17f809b9, pg_repack 1.5.1-1.module+el9.6.0+22880+6b241eec, postgresql 16.15-1.module+el9.6.0+24915+52fd15c1, postgresql-test 16.15-1.module+el9.6.0+24915+52fd15c1, postgresql-pltcl 16.15-1.module+el9.6.0+24915+52fd15c1, +8 more
    fixed: vendor fix “Restrict schema creation permissions to prevent untrusted database accounts from building indexes, or remove the optional pgvector package if vector indexing is not needed.” RHSA-2026:93460

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a pgvector

Classification

Weakness
  • CWE-787 Out-of-bounds Write
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.