What is CVE-2026-56207?

CVE-2026-56207 is a critical-severity vulnerability in Apache Impala, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-09-09.

How severe is CVE-2026-56207?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apache Impala

CVE-2026-56207

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.

Published 2026-09-09 · last modified 2026-09-10.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

lists.apache.org/thread/20cov78py0zqzx7dyq39ktythkwn91zs (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-56207?: CVE-2026-56207 is a critical-severity vulnerability in Apache Impala, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2026-09-09.
How severe is CVE-2026-56207?: Critical severity. CVSS v3 base score is 9.8 out of 10.