CVE-2026-14661
PostgreSQL dblink and subscriptions can append to arbitrary files
Description
External control of file name in PostgreSQL dblink and CREATE/ALTER SUBSCRIPTION allows a user to achieve persistent denial of service, via appending invalid data to a chosen file. Specifically, the "sslkeylogfile" connection parameter appends data, in NSS keylog format, to a file of the user's choosing. This "sslkeylogfile" mechanism cannot add arbitrary bytes. Within major version 18, minor versions before PostgreSQL 18.7 are affected. Versions before PostgreSQL 18 are also affected if libpq version 18 or later is installed and in use by the server.
INFO
Published Date :
Nov. 12, 2026, 3:17 p.m.
Last Modified :
Nov. 12, 2026, 3:17 p.m.
Remotely Exploit :
No
Source :
f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update PostgreSQL to version 18.7 or later.
- Ensure libpq is updated if using older PostgreSQL versions.
- Limit file write access for database users.
- Monitor log files for unexpected appends.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-14661.
| URL | Resource |
|---|---|
| https://www.postgresql.org/support/security/CVE-2026-14661/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-14661 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-14661
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-14661 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-14661 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
Nov. 12, 2026
Action Type Old Value New Value Added Description External control of file name in PostgreSQL dblink and CREATE/ALTER SUBSCRIPTION allows a user to achieve persistent denial of service, via appending invalid data to a chosen file. Specifically, the "sslkeylogfile" connection parameter appends data, in NSS keylog format, to a file of the user's choosing. This "sslkeylogfile" mechanism cannot add arbitrary bytes. Within major version 18, minor versions before PostgreSQL 18.7 are affected. Versions before PostgreSQL 18 are also affected if libpq version 18 or later is installed and in use by the server. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Added CWE CWE-73 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/14xxx/CVE-2026-14661.json">CVE-2026-14661</a> Added Reference https://www.postgresql.org/support/security/CVE-2026-14661/