# CVE-2026-14661: PostgreSQL dblink and subscriptions can append to arbitrary files

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

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.

## Remediation

- workaround: Revoke public EXECUTE permission on dblink functions

Revoke pg_create_subscription from any roles that do not already have pg_write_server_files privileges (source: CNA: PostgreSQL)

## Affected products and versions

- n/a / PostgreSQL: ≥ 18; < 18.7 (affected, rpm); ≥ 17; < 17.12 (affected, rpm); ≥ 16; < 16.16 (affected, rpm); ≥ 15; < 15.20 (affected, rpm); ≥ 0; < 14.25 (affected, rpm). Source: CNA: PostgreSQL

## Severity and prioritization

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H; source: CNA: PostgreSQL

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-73

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.postgresql.org/support/security/CVE-2026-14661/ (CNA: PostgreSQL)

## Provenance

- CNA: PostgreSQL: https://www.cve.org/CVERecord?id=CVE-2026-14661; retrieved 2026-11-12; source updated 2026-11-12

Revision: ea0951dfa6fe8bc95b04088561041500036bedee5258e2cfa1c63a0edafad365

Canonical: https://y2.dev/cve/CVE-2026-14661

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