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

Critical 9.8 Published 9 Sep 2026 Updated 10 Sep 2026

Attackers can bypass SAML authentication in Apache Impala by forging bearer tokens, allowing them to impersonate other users and escalate privileges.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-56207?

CVE-2026-56207 is a critical authentication bypass vulnerability in Apache Impala, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-347

Which versions are affected by CVE-2026-56207?

It affects 1 product.

Products include Apache Impala.

How do I fix CVE-2026-56207?

No fix has been published for CVE-2026-56207 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-56207 being exploited?

There is no known exploitation of CVE-2026-56207 in the wild and no public exploit code.

Sources

Also known as GHSA-3mmv-f538-2fpw.