What is CVE-2026-42811?

CVE-2026-42811 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-2026-42811?

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

RCE in Apache Polaris

CVE-2026-42811

In plain terms, Apache Polaris is supposed to issue short-lived GCS credentials that only work for one table's files, but a crafted namespace or table name can cause those credentials to work across the configured bucket instead. Apache…

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

EPSS: 0.001 (29.7th 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-2026-42811?: CVE-2026-42811 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-2026-42811?: Critical severity. CVSS v3 base score is 9.9 out of 10.