CVE-2025-12818

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
postgresql-18	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
postgresql-17	25.10 questing	Fixed 17.7-0ubuntu0.25.10.1
	25.04 plucky	Fixed 17.7-0ubuntu0.25.04.1
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
postgresql-16	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Fixed 16.11-0ubuntu0.24.04.1
	22.04 LTS jammy	Not in release
postgresql-14	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Fixed 14.20-0ubuntu0.22.04.1
postgresql-12	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Needs evaluation
postgresql-10	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Needs evaluation
postgresql-9.5	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	16.04 LTS xenial	Needs evaluation
postgresql-9.3	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	14.04 LTS trusty	Vulnerable, fix deferred

Notes

leosilva

PostgreSQL 9.3 is end of life upstream, and no updates are are available. Marking as deferred in -esm-main releases.

mdeslaur

postgresql-17 is likely to be removed from resolute before release, marking as deferred for now.

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7908-1
PostgreSQL vulnerabilities
3 December 2025