No exploitation reportedFix available

CVE-2026-6473

Q: Is CVE-2026-6473 actively exploited?

Active exploitation of CVE-2026-6473 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-6473?

CVE-2026-6473 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2026-05-14
Fixed in18.4 · 17.10 · 16.14 · 15.18 · 14.23
WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the operating system user running the database. In applications that pass gigabyte-scale user inputs to the relevant database functions, the application input provider may achieve a segmentation fault. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Timeline

dates in UTC

2026-05-1414:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6473?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6473?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

PostgreSQL

Branch	Affected	Fixed in	Source
18.x	≥ 18.0, < 18.4	18.4	NVD
17.x	≥ 17.0, < 17.10	17.10	NVD
16.x	≥ 16.0, < 16.14	16.14	NVD
15.x	≥ 15.0, < 15.18	15.18	NVD
14.23	< 14.23	14.23	NVD

postgresql

Branch	Affected	Fixed in	Source
18.x	≥ 18.0.0, < 18.4.0	18.4.0	OSV
17.x	≥ 17.0.0, < 17.10.0	17.10.0	OSV
16.x	≥ 16.0.0, < 16.14.0	16.14.0	OSV
15.x	≥ 15.0.0, < 15.18.0	15.18.0	OSV
14.23	< 14.23.0	14.23.0	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libpqAlmaLinux:8all versions · fixed in 13.23-2.el8_10and 1 other package
pg_repackAlmaLinux:9all versions · fixed in 1.4.8-2.module_el9.5.0+119+18833d03
pg_repackAlmaLinux:9all versions · fixed in 1.5.1-1.module_el9.6.0+146+c54fdeca
pg_repackAlmaLinux:9all versions · fixed in 1.5.3-1.module_el9.8.0+234+5456f35d
pg_repackAlmaLinux:8all versions · fixed in 1.4.6-3.module_el8.9.0+3704+f1f917ce
pg_repackAlmaLinux:8all versions · fixed in 1.4.8-1.module_el8.9.0+3706+885c732e
pg_repackAlmaLinux:8all versions · fixed in 1.5.1-1.module_el8.10.0+3930+ecf33554
pg_repackAlmaLinux:8all versions · fixed in 1.5.1-1.module_el8.10.0+4125+ceaf7d1b

26 more package ranges on OSV.dev

Vendor advisories

CVE-2026-6473 Red Hat Product Security3,483 products fixed · 11 known affected
postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write
postgresql as a component of Red Hat Enterprise Linux 6 · postgresql-contrib as a component of Red Hat Enterprise Linux 6 · postgresql-devel as a component of Red Hat Enterprise Linux 6 · +8 more
RHSA-2026:58981 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 Technology Preview security update
RHSA-2026:49521 Red Hat Product Security75 products fixed
Red Hat Security Advisory: postgresql security update
RHSA-2026:44568 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.2 security update
RHSA-2026:44481 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Update Infrastructure 5.2 security update
RHSA-2026:44420 Red Hat Product Security22 products fixed
Red Hat Security Advisory: libpq security update

29 more advisories

Full record on NVD

Fix

Update PostgreSQL to 18.4 · 17.10 · 16.14 · 15.18 · 14.23
Vendor fix Red Hat Product Security RHSA-2026:58981 · 1 productPlease consult the RHUI Technology Preview Release Notes at https://access.redhat.com/articles/7141172 for instructions on how to use this image set.
Vendor fix Red Hat Product Security RHSA-2026:49521 · 75 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2026:44568 · 1 productFor more about Ansible Portal Installer Bootc, see References links
Vendor fix Red Hat Product Security RHSA-2026:44481 · 1 productThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.
Workaround from the vendor Red Hat Product Security RHSA-2026:58981 · 4 productsTo mitigate this vulnerability, validate the length of data and the size of objects on all client APIs and web interfaces. Also, block, drop, or truncate oversized string, array, or binary objects before they are passed into backend SQL queries.

Advisories and patches

www.postgresql.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-05-14
OpenCVESSVC decisionnone—
CNACVSS 3.18.8read 2026-10-23
CNAweakness (CWE)CWE-190read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-23
OSVaffected packages—
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-05-14
Last Modified: 2026-08-25
NVD status: Modified
MSRC Title: PostgreSQL server undersizes allocations, via integer wraparound

Frequently asked questions

What is CVE-2026-6473?

Is CVE-2026-6473 actively exploited?

Active exploitation of CVE-2026-6473 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-6473?

CVE-2026-6473 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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