PostgreSQL row security caching disregards role modifications (CVE-2026-14666) | HOL Guard CVE

Medium · CVSS 4.2CVE-2026-14666

PostgreSQL row security caching disregards role modifications

Answer in brief

CVE-2026-14666 records a Medium severity (CVSS 4.2) vulnerability in PostgreSQL row security caching disregards role modifications. The current sources do not mark it as known exploited. The current feed maps n/a/PostgreSQL (generic), n/a/PostgreSQL (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 13, 2026Updated Aug 29, 2026Source checked Sep 27, 2026First seen by HOL Aug 13, 2026Material review Aug 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.2
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/PostgreSQL (generic), n/a/PostgreSQL (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:postgresql:postgresql::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n/a/PostgreSQLgeneric	>=18 <18.5 \|\| >=17 <17.11 \|\| >=16 <16.15 \|\| >=15 <15.19 \|\| >=0 <14.24	18.5, 17.11, 16.15, 15.19, 14.24
n/a/PostgreSQLgeneric	>=18 <18.6 \|\| >=17 <17.11 \|\| >=16 <16.15 \|\| >=15 <15.19 \|\| >=0 <14.24	18.6, 17.11, 16.15, 15.19, 14.24

Recommended response

Check inventory. Check lockfiles and deployed manifests for n/a/PostgreSQL, n/a/PostgreSQL.
Review the reported fix. Update n/a/PostgreSQL to 18.5; n/a/PostgreSQL to 18.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 13, 2026

Sources and claim methodology

Source referencepostgresql.org

Upstream source description

Incomplete tracking in PostgreSQL of changes to role membership, role attributes, and database ownership allows a query to continue using cached row-level security policies after those changes require a different policy, via plan reuse. Stale policies continue until some other event invalidates the cache or connection termination ends the session. This permits a user to complete reads and modifications that were recently permitted but now forbidden. An attacker must tailor an attack to a particular application's pattern of privilege removal and role-specific row security policies. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

Quoted source text, attributed separately from HOL analysis.