CVE-2026-56207

Analyzed Analyzed - Analysis Complete

SAML2 Authentication Bypass in Apache Impala

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: Apache Software Foundation

Description

Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface, allowing altering user name and acting as another user. This issue affects Apache Impala: >=4.0.0. Users are recommended to upgrade to version 4.5.2, which fixes this issue.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-56207

EUVD

EUVD-2026-74797

Affected Vendors & Products

Vendor	Product	Version / Range
apache	impala	From 4.0.0 (inc) to 4.5.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-347	The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Attack-Flow Graph

Executive Summary

This vulnerability involves a flaw in Apache Impala's SAML2 authentication process for the hs2-http interface. The Bearer token's signature is not verified during the final step, allowing attackers to modify the username and impersonate other users.

Detection Guidance

To detect this vulnerability, check the Impala version running on your system. If it is between 4.0.0 and 4.5.1, the system is vulnerable. Run the command: impala version or check the Impala service logs for version details.

Impact Analysis

An attacker could exploit this to alter their username and impersonate another user, potentially gaining unauthorized access to sensitive data or performing actions on behalf of other users.

Compliance Impact

This vulnerability could potentially violate compliance with GDPR and HIPAA by allowing unauthorized user impersonation. If an attacker alters a username during SAML2 authentication, they could gain access to sensitive data without proper authorization, which conflicts with GDPR's data protection principles and HIPAA's access control requirements.

Mitigation Strategies

Upgrade Apache Impala to version 4.5.2 or later to fix the SAML2 Bearer token signature verification issue in the hs2-http interface.

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