PostgreSQL dblink and subscriptions can append to arbitrary files

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-14661
StatePUBLISHED
AssignerPostgreSQL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-12 15:17:49 UTC
Updated2026-11-12 22:19:21 UTC
DescriptionExternal 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Problem Types: CWE-73 | CWE-73 External Control of File Name or Path

VersionSourceTypeScoreSeverityVector
3.1f86ef6dc-4d3a-42ad-8f28-e6d5547a5007Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1CNACVSS8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na PostgreSQL affected 18 18.7 rpm Not specified
CNA Na PostgreSQL affected 17 17.12 rpm Not specified
CNA Na PostgreSQL affected 16 16.16 rpm Not specified
CNA Na PostgreSQL affected 15 15.20 rpm Not specified
CNA Na PostgreSQL affected 14.25 rpm Not specified

References

ReferenceSourceLinkTags
www.postgresql.org/support/security/CVE-2026-14661 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 www.postgresql.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: The PostgreSQL project thanks Andrey Krasichkov, b.altawil, and Zsolt Parragi for reporting this problem. (en)

Additional Advisory Data

Workarounds

CNA: Revoke public EXECUTE permission on dblink functions

CNA: Revoke pg_create_subscription from any roles that do not already have pg_write_server_files privileges

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