How severe is CVE-2026-47898?

CVE-2026-47898 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-2026-47898 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47898?

CVE-2026-47898 primarily affects Apache Lucene.net. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-47898?

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-2026-47898 published?

CVE-2026-47898 was published on 2026-07-03 and last updated on 2026-07-08.

CVE-2026-47898

CVE-2026-47898 is a critical-severity vulnerability in Apache Lucene.net 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-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 4.0
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Apache Lucene.net
Published: 2026-07-03
Last modified: 2026-07-08

Description

Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.Common library). This issue affects Apache Lucene.Net.Analysis.Common: from 4.8.0-beta00005 before 4.8.0-beta00018. Users are recommended to upgrade to version 4.8.0-beta00018, which fixes the issue.

Frequently asked questions

What is CVE-2026-47898?: Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.Common library). This issue affects Apache Lucene.Net.Analysis.Common: from 4.8.0-beta00005 before 4.8.0-beta00018. Users are recommended to upgrade to version 4.8.0-beta00018, which fixes the issue.
How severe is CVE-2026-47898?: CVE-2026-47898 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-2026-47898 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47898?: CVE-2026-47898 primarily affects Apache Lucene.net. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-47898?: 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-2026-47898 published?: CVE-2026-47898 was published on 2026-07-03 and last updated on 2026-07-08.

References

Affected products (13)

cpe:2.3:a:apache:lucene.net:4.8.0:beta00005:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00006:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00007:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00008:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00009:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00010:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00011:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00012:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00013:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00014:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00015:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00016:*:*:*:*:*:*
cpe:2.3:a:apache:lucene.net:4.8.0:beta00017:*:*:*:*:*:*

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