What is CVE-2026-78155?

CVE-2026-78155 is a critical-severity vulnerability in Ongres Stackgres, classified under Untrusted Search Path. CVSS score: 9.9/10. Published 2026-08-23.

How severe is CVE-2026-78155?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in Ongres Stackgres

CVE-2026-78155

privilege escalation in StackGres operator allows a low-privilege tenant who owns a database to gain administrator privileges

Published 2026-08-23 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.2th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Ongres Stackgres

Weakness classification (CWE)

CWE-426 — Untrusted Search Path

References

gitlab.com/ongresinc/stackgres/-/work_items/3177 (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78155?: CVE-2026-78155 is a critical-severity vulnerability in Ongres Stackgres, classified under Untrusted Search Path. CVSS score: 9.9/10. Published 2026-08-23.
How severe is CVE-2026-78155?: Critical severity. CVSS v3 base score is 9.9 out of 10.