CVE-2026-56207: Apache Impala: SAML authentication bypass via forged bearer token

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-10
Weakness: CWE-347

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.

Affected products

Apache Software Foundation Apache Impala: from 4.0.0 before 4.5.2 — fixed in 4.5.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Impala 4.5.2. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/20cov78py0zqzx7dyq39ktythkwn91zs
http://www.openwall.com/lists/oss-security/2026/09/08/22

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