How severe is CVE-2026-66755?

CVE-2026-66755 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-66755 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-2026-66755?

CVE-2026-66755 primarily affects Apache Tika. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-66755?

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

When was CVE-2026-66755 published?

CVE-2026-66755 was published on 2026-07-30 and last updated on 2026-08-10.

CVE-2026-66755

CVE-2026-66755 is a high-severity vulnerability in Apache Tika with a CVSS 3.x base score of 7.5. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 5.9
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Apache Tika
Published: 2026-07-30
Last modified: 2026-08-10

Description

Relative Path Traversal in the ISA-Tab parser in Apache Software Foundation Apache Tika from 1.8 through 3.3.1, and 4.0.0-alpha-1, allows an attacker who can place files in a directory that the application subsequently parses to read arbitrary files accessible to the Tika process and have their contents emitted into the extracted text output, via a "Study Assay File Name" value in the ISA-Tab investigation file that traverses outside the dataset directory. Users are recommended to upgrade to version 3.3.2 or 4.0.0-beta-1, which fixes this issue.

Frequently asked questions

What is CVE-2026-66755?: Relative Path Traversal in the ISA-Tab parser in Apache Software Foundation Apache Tika from 1.8 through 3.3.1, and 4.0.0-alpha-1, allows an attacker who can place files in a directory that the application subsequently parses to read arbitrary files accessible to the Tika process and have their contents emitted into the extracted text output, via a "Study Assay File Name" value in the ISA-Tab investigation file that traverses outside the dataset directory. Users are recommended to upgrade to version 3.3.2 or 4.0.0-beta-1, which fixes this issue.
How severe is CVE-2026-66755?: CVE-2026-66755 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-66755 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-2026-66755?: CVE-2026-66755 primarily affects Apache Tika. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-66755?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-66755 published?: CVE-2026-66755 was published on 2026-07-30 and last updated on 2026-08-10.

References

Affected products (3)

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

More vulnerabilities in Apache Tika

CVE-2026-66756 — Critical (CVSS 9.8): Improper Protection of Alternate Path vulnerability in Apache Tika. This issue affects Apache Tika: from 4.0.0-alpha-1…
CVE-2016-6809 — Critical (CVSS 9.8): Apache Tika before 1.14 allows Java code execution for serialized objects embedded in MATLAB files. The issue exists…
CVE-2019-10088 — High (CVSS 8.8): A carefully crafted or corrupt zip file can cause an OOM in Apache Tika's RecursiveParserWrapper in versions 1.7-1.21.…
CVE-2025-66516 — High (CVSS 8.4): Critical XXE in Apache Tika tika-core (1.13-3.2.1), tika-pdf-module (2.0.0-3.2.1) and tika-parsers (1.13-1.28.5)…
CVE-2025-54988 — High (CVSS 8.4): Critical XXE in Apache Tika (tika-parser-pdf-module) in Apache Tika 1.13 through and including 3.2.1 on all platforms…
CVE-2018-1335 — High (CVSS 8.1): From Apache Tika versions 1.7 to 1.17, clients could send carefully crafted headers to tika-server that could be used…

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