How severe is CVE-2026-66756?

CVE-2026-66756 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-66756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-66756?

CVE-2026-66756 primarily affects Apache Tika. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-66756?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-66756 published?

CVE-2026-66756 was published on 2026-07-30 and last updated on 2026-08-10.

CVE-2026-66756

CVE-2026-66756 is a critical-severity vulnerability in Apache Tika with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-424.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 6.9
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-424
Affected product: Apache Tika
Published: 2026-07-30
Last modified: 2026-08-10

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-66756?: CVE-2026-66756 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-66756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-66756?: CVE-2026-66756 primarily affects Apache Tika. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-66756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-66756 published?: CVE-2026-66756 was published on 2026-07-30 and last updated on 2026-08-10.

References

Affected products (2)

cpe:2.3:a:apache:tika:4.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:apache:tika:4.0.0:beta1-rc1:*:*:*:*:*:*

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