External Control of File Name or Path in PostgreSQL - CVE-2026-14661
Published: November 12, 2026
Vulnerability identifier: #VU166136
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-14661
CWE-ID: CWE-73
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to corrupt chosen files by appending data and cause a persistent denial of service.
The vulnerability exists due to external control of file names in PostgreSQL dblink and CREATE/ALTER SUBSCRIPTION when processing connection parameters. A remote user can specify a chosen file through the "sslkeylogfile" connection parameter to append NSS keylog data, corrupting file contents and causing a persistent denial of service.
The mechanism cannot append arbitrary bytes.
Affected software
PostgreSQL
How to mitigate CVE-2026-14661
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.25, 15.20, 16.16, 17.12, 18.7