External risk intelligence

Apache Polaris weakness lets attackers control data access credentials

CVE advisorySeverity: CRITICAL (CVSS 9.4)

CVE-2026-42809

An external attacker can manipulate Apache Polaris table creation requests to obtain unauthorized credentials for restricted storage locations. This flaw allows unauthorized parties to steal or modify sensitive cloud data, impacting business information integrity.

2Halo Surface Signal

Apache Polaris

before 1.4.1

External exposure likelihood

Halo Surface Signal score for CVE-2026-42809

Apache Polaris is a backend data catalog and metadata management service. Such systems are typically deployed within private corporate networks or internal data platforms rather than being exposed directly to the public internet. Access is generally limited to internal users or automated data pipelines, making public-facing deployments uncommon.

Horizon Alert

Summary of the vulnerability and why it matters

Apache Polaris can mistakenly issue broad storage credentials before fully validating table locations. This allows an attacker to direct where temporary credentials grant access, potentially exposing sensitive data or metadata. It is important to pay attention to this vulnerability because it can be exploited by an attacker with existing access.

  • Can lead to unauthorized data access.
  • Affects users with existing system access.
  • Allows attackers to influence credential scope.

Attack Path

How an attacker could exploit the issue

An attacker with low-privileged access to Apache Polaris could exploit this flaw to gain unauthorized access to data. By providing a custom storage location during staged table creation, the attacker can trick Polaris into issuing temporary credentials that grant access to that chosen location, potentially exposing sensitive data or metadata.

  • Low-privileged user access required.
  • Targets staged table creation API.
  • Attacker controls target storage location.

Live Threat

Current exploitation, exposure, and threat context

Attackers may find this vulnerability appealing due to the broad credential vending mechanism, allowing for attacker-controlled location redirection before thorough validation. This could enable unauthorized access to data or metadata.

  • No public exploit observed.
  • No KEV listing.
  • Vendor issued advisory.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize reviewing logs for suspicious staged table creation requests that include custom locations or write path overrides. Investigate any alerts indicating the vending of broad temporary storage credentials before location validation.

  • Block attacker-influenced location inputs.
  • Monitor for unauthorized data access.
  • Update Apache Polaris to 1.4.1.

Frequently asked questions

What is Apache Polaris and its function in data management?

Apache Polaris is a backend service designed for data cataloging and metadata management. It helps in organizing and managing information within data platforms, which in turn simplifies the process for both users and systems to locate and access data.

How does CVE-2026-42809 relate to CWE-20, Improper Input Validation?

CVE-2026-42809 is associated with a CWE-20 weakness, specifically Improper Input Validation. This vulnerability arises because Apache Polaris does not correctly handle certain inputs, such as custom storage locations specified during the creation of staged tables, leading to security issues.

What is the trigger path for the Apache Polaris vulnerability?

The vulnerability is triggered when a user provides a custom 'location' during the staged table creation process and requests credential vending. Apache Polaris then uses this supplied location to generate delegated storage credentials without first performing the standard location validation or overlap checks.

How does this vulnerability impact data access control?

This vulnerability allows an attacker with low-privileged access to influence the scope of temporary storage credentials. By specifying a custom target location, an attacker can direct where these credentials grant access, potentially leading to unauthorized access to sensitive data or metadata.

What actions should be taken to address this vulnerability?

Organizations should review logs for suspicious staged table creation requests that involve custom locations or write path overrides. Monitoring for alerts related to the vending of broad temporary storage credentials before location validation is also recommended. Updating Apache Polaris to version 1.4.1 is advised to mitigate this risk.

References