PostgreSQL up to 18.0 libpq Client Library integer overflow

Summaryinfo

A vulnerability was found in PostgreSQL up to 18.0. It has been rated as problematic. Affected is an unknown function of the component libpq Client Library. This manipulation causes integer overflow. This vulnerability appears as CVE-2025-12818. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in PostgreSQL up to 18.0. Affected by this vulnerability is an unknown function of the component libpq Client Library. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect availability. The summary by CVE is:

Integer wraparound in multiple PostgreSQL libpq client library functions allows an application input provider or network peer to cause libpq to undersize an allocation and write out-of-bounds by hundreds of megabytes. This results in a segmentation fault for the application using libpq. Versions before PostgreSQL 18.1, 17.7, 16.11, 15.15, 14.20, and 13.23 are affected.

The advisory is shared at postgresql.org. This vulnerability is known as CVE-2025-12818 since 11/06/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 275356 (Linux Distros Unpatched Vulnerability : CVE-2025-12818), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 13.23, 14.20, 15.15, 16.11, 17.7 or 18.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (275356) and CERT Bund (WID-SEC-2025-2600). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source PostgreSQL
• IBM Sterling Connect:Direct

Productinfo

Type

• Database Software

Name

• PostgreSQL

Version

• 13.0
• 13.1
• 13.2
• 13.3
• 13.4
• 13.5
• 13.6
• 13.7
• 13.8
• 13.9
• 13.10
• 13.11
• 13.12
• 13.13
• 13.14
• 13.15
• 13.16
• 13.17
• 13.18
• 13.19
• 13.20
• 13.21
• 13.22
• 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
• 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
• 16.0
• 16.1
• 16.2
• 16.3
• 16.4
• 16.5
• 16.6
• 16.7
• 16.8
• 16.9
• 16.10
• 17.0
• 17.1
• 17.2
• 17.3
• 17.4
• 17.5
• 17.6
• 18.0

License

• open-source

Website

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

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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