Critical severity · published Sep 9, 2026
CVE-2026-56207
Apache Impala: SAML authentication bypass via forged bearer token
9.8
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AI
Apache Impala · Apache Software Foundation
4.0.0 through 4.5.1 · source: vendor
IM
Impala · Apache
4.0.0 before 4.5.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56207
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56207
Mailing List
https://lists.apache.org/thread/20cov78py0zqzx7dyq39ktythkwn91zs
Mailing List
http://www.openwall.com/lists/oss-security/2026/09/08/22
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