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Critical PostgreSQL Vulnerability Exposes Databases to Remote Code Execution

Critical PostgreSQL Vulnerability Exposes Databases to Remote Code Execution

First seen 4 Sep 2026, 12:28 UTC • •
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ThreatCluster AI
ThreatCluster •September 5, 2026 at 11:29 UTC
  • •CVE-2026-6471 allows low-privilege accounts to execute arbitrary code.
  • •The vulnerability has existed since 2014 and affects numerous major companies.
  • •A patch was released on August 13, 2026, but exploitation is possible.

A critical vulnerability, tracked as CVE-2026-6471 and dubbed PostGREShell, has been discovered in PostgreSQL, affecting versions since 2014. This flaw allows attackers with low-privilege replication accounts to execute arbitrary code on the database server, leading to full database and server compromise. The vulnerability was identified by Cyera Research and has a CVSS score of 7.2. Exploitation requires an account with the REPLICATION attribute and a server configured with wal_level set to logical. The flaw has been present in over 39,000 companies using PostgreSQL, including major platforms like Netflix and Uber. A patch was released on August 13, 2026, to address this issue. Attackers can leverage this vulnerability to install persistent backdoors and escalate privileges to superuser status. The vulnerability's wide impact stems from PostgreSQL's role in handling sensitive data across various sectors.

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Timeline

2019-04-13
Public exploit for CVE-2025-49844 released
A proof-of-concept exploit appeared on GitHub, lowering the barrier for opportunistic attackers.
GitHub
2026-08-13
Patch released for CVE-2026-6471
PostgreSQL released updates to fix the critical vulnerability affecting versions since 2014.
Thehackernews
2026-09-04
Vulnerability disclosed by Cyera Research
Cyera Research published details about the PostGREShell vulnerability, highlighting its severe implications for PostgreSQL users.
www.cyera.com
2026-09-04
Multiple articles report on the vulnerability
Various cybersecurity outlets reported on the PostGREShell vulnerability, emphasizing its impact and the need for immediate patching.
Securityaffairs.Co

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