PostgreSQL up to 18.1 Multibyte Character array index

Summaryinfo

A vulnerability described as critical has been identified in PostgreSQL up to 14.20/15.15/16.11/17.7/18.1. The impacted element is an unknown function of the component Multibyte Character Handler. Such manipulation leads to array index. This vulnerability is referenced as CVE-2026-2006. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in PostgreSQL up to 14.20/15.15/16.11/17.7/18.1. It has been rated as critical. Affected by this issue is an unknown code block of the component Multibyte Character Handler. The manipulation with an unknown input leads to a array index vulnerability. Using CWE to declare the problem leads to CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Missing validation of multibyte character length in PostgreSQL text manipulation allows a database user to issue crafted queries that achieve a buffer overrun. That suffices to execute arbitrary code as the operating system user running the database. Versions before PostgreSQL 18.2, 17.8, 16.12, 15.16, and 14.21 are affected.

The advisory is available at postgresql.org. This vulnerability is handled as CVE-2026-2006 since 02/05/2026. The exploitation is known to be easy. The attack may be launched remotely. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 298910 (Linux Distros Unpatched Vulnerability : CVE-2026-2006), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 14.21, 15.16, 16.12, 17.8 or 18.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (298910) and CERT Bund (WID-SEC-2026-0409). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source PostgreSQL

Productinfo

Type

• Database Software

Name

• PostgreSQL

Version

• 14.0
• 14.1
• 14.2
• 14.3
• 14.4
• 14.5
• 14.6
• 14.7
• 14.8
• 14.9
• 14.10
• 14.11
• 14.12
• 14.13
• 14.14
• 14.15
• 14.16
• 14.17
• 14.18
• 14.19
• 14.20
• 15.0
• 15.1
• 15.2
• 15.3
• 15.4
• 15.5
• 15.6
• 15.7
• 15.8
• 15.9
• 15.10
• 15.11
• 15.12
• 15.13
• 15.14
• 15.15
• 16.0
• 16.1
• 16.2
• 16.3
• 16.4
• 16.5
• 16.6
• 16.7
• 16.8
• 16.9
• 16.10
• 16.11
• 17.0
• 17.1
• 17.2
• 17.3
• 17.4
• 17.5
• 17.6
• 17.7
• 18.0
• 18.1

License

• open-source

Website

• Product: https://www.postgresql.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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