Is CVE-2026-42811 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-42811 being exploited in the wild.

How severe is CVE-2026-42811?

Critical severity, with a CVSS score of 9.9, published 4 May 2026.

Which products and versions are affected?

org.apache.polaris:polaris-core (Maven) ECOSYSTEM:introduced=0,fixed=1.4.1.

Is there a fix for CVE-2026-42811?

Yes. org.apache.polaris:polaris-core (Maven): upgrade to 1.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-42811 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-42811?

Check whether you run Apache Polaris or org.apache.polaris:polaris-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-42811: Apache Polaris expression injection in GCS credential delegation

CVE-2026-42811 · Severity: critical · CVSS 9.9 · Published 2026-05-04

Apache Polaris, a data management service, contains a flaw in how it handles Google Cloud Storage (GCS) permissions. An attacker can use specially crafted table or namespace names to bypass security restrictions and obtain broad access to an entire storage bucket. This allows unauthorized users to read, modify, or delete sensitive data across the entire bucket, rather than being restricted to a single table.

Technologies: Apache Polaris. Vendors: Apache, Maven.

Quick answers

Is CVE-2026-42811 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-42811 being exploited in the wild.
How severe is CVE-2026-42811?: Critical severity, with a CVSS score of 9.9, published 4 May 2026.
Which products and versions are affected?: org.apache.polaris:polaris-core (Maven) ECOSYSTEM:introduced=0,fixed=1.4.1.
Is there a fix for CVE-2026-42811?: Yes. org.apache.polaris:polaris-core (Maven): upgrade to 1.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-42811 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-42811?: Check whether you run Apache Polaris or org.apache.polaris:polaris-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

org.apache.polaris:polaris-core (Maven): upgrade to 1.4.1 or later

# set org.apache.polaris:polaris-core to 1.4.1 in your pom.xml or build.gradle

Technical details

Apache Polaris is vulnerable to an expression language injection in its Google Cloud Storage (GCS) credential delegation mechanism. The service constructs Common Expression Language (CEL) strings for Credential Access Boundaries (CAB) by concatenating bucket names and table paths without proper escaping. An attacker with permissions to create or interact with namespaces/tables can use single quotes and URI-safe CEL fragments to break out of the intended string literal. This 'collapses' the path restriction, granting the attacker delegated credentials with full list, read, and write access to the entire GCS bucket. The vulnerability is confirmed in version 1.4.0 and addressed in 1.4.1.

Affected products

Apache Polaris before 1.4.1

Identifiers

CVE-2026-42811
GHSA-fc3h-c6h7-r83j

Timeline

2026-05-02: disclosed: Initial disclosure on oss-security mailing list
2026-05-04: advisory: NVD publication date
2026-05-04: patched: Fix available in version 1.4.1

References

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