Buffer Over-Read Vulnerability in PostgreSQL's Parallel B-tree Scans
CVE-2026-116333

6.5MEDIUM

Key Information:

Vendor

PostgreSQL
Status
Postgresql
Vendor
CVE Published:
12 November 2026

What is CVE-2026-116333?

A buffer over-read vulnerability has been identified in PostgreSQL's parallel B-tree scan functionality. This issue arises when a function is incorrectly marked as PARALLEL SAFE or STABLE, allowing object creators to read arbitrary server memory addresses chosen by an attacker. The vulnerability affects major PostgreSQL versions 17 and 18, specifically impacting minor versions prior to 18.7 and 17.12. Affected users are urged to upgrade to the latest versions to mitigate potential risks.

Affected Version(s)

PostgreSQL 18 < 18.7

PostgreSQL 17 < 17.12

References

https://www.postgresql.org/support/security/CVE-2026-116333/

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

The PostgreSQL project thanks Claude and Ada Logics for reporting this problem.
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