What is CVE-2026-66756?

CVE-2026-66756 is a critical-severity vulnerability in Apache Tika, classified under CWE-424. CVSS score: 9.8/10. Published 2026-07-30.

How severe is CVE-2026-66756?

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

Vulnerability in Apache Tika

CVE-2026-66756

Improper Protection of Alternate Path vulnerability in Apache Tika. This issue affects Apache Tika: from 4.0.0-alpha-1 before 4.0.0-beta-1. Users are recommended to upgrade to version 4.0.0-beta-1, which fixes the issue.

EPSS: 0.004 (37.6th percentile) — read the EPSS interpretation.

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.

Affected products

Apache Tika — versions 4.0.0
Apache Software Foundation Tika — versions 4.0.0-alpha-1

Weakness classification (CWE)

CWE-424

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-66756?: CVE-2026-66756 is a critical-severity vulnerability in Apache Tika, classified under CWE-424. CVSS score: 9.8/10. Published 2026-07-30.
How severe is CVE-2026-66756?: Critical severity. CVSS v3 base score is 9.8 out of 10.