What is CVE-2026-42809?

CVE-2026-42809 is a critical-severity vulnerability in Apache Polaris, classified under Improper Input Validation. CVSS score: 9.9/10. Published 2026-05-04.

How severe is CVE-2026-42809?

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

Auth bypass in Apache Polaris

CVE-2026-42809

Apache Polaris can issue broad temporary ("vended") storage credentials during staged table creation before the effective table location has been validated or durably reserved. Those temporary credentials are meant to limit the scope of a…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (26.3th percentile) — read the EPSS interpretation.

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.

Affected products

Apache Polaris
Apache Software Foundation Polaris — versions 0

Weakness classification (CWE)

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-42809?: CVE-2026-42809 is a critical-severity vulnerability in Apache Polaris, classified under Improper Input Validation. CVSS score: 9.9/10. Published 2026-05-04.
How severe is CVE-2026-42809?: Critical severity. CVSS v3 base score is 9.9 out of 10.