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CVE-2026-47898 Apache Software Foundation CVE debrief

CVE-2026-47898 is an Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.Common library). The issue affects Apache Lucene.Net.Analysis.Common versions 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. This vulnerability allows attackers to potentially read or execute local files, conduct SSRF attacks, or cause a denial of service. Affected users should review and update affected systems and applications.

Vendor
Apache Software Foundation
Product
Apache Lucene.Net
CVSS
MEDIUM 4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-03
Original CVE updated
2026-07-08
Advisory published
2026-07-03
Advisory updated
2026-07-08

Who should care

Users of Apache Lucene.Net.Analysis.Common library versions from 4.8.0-beta00005 before 4.8.0-beta00018 should be aware of this vulnerability and take necessary actions to upgrade to a secure version. Affected operator, platform, vulnerability-management, and security-team impact should be reviewed.

Technical summary

The CVE-2026-47898 vulnerability is caused by an Improper Restriction of XML External Entity Reference in the Apache Lucene.Net (Lucene.Net.Analysis.Common library). This issue allows attackers to potentially read or execute local files, conduct SSRF attacks, or cause a denial of service. The vulnerability has a CVSS score of 4 and a severity of MEDIUM. Users of Apache Lucene.Net.Analysis.Common library versions from 4.8.0-beta00005 before 4.8.0-beta00018 should be aware of this vulnerability and take necessary actions to upgrade to a secure version.

Defensive priority

Medium priority should be given to upgrading Apache Lucene.Net.Analysis.Common library to version 4.8.0-beta00018 or later.

Recommended defensive actions

  • Upgrade Apache Lucene.Net.Analysis.Common library to version 4.8.0-beta00018 or later
  • Review and update affected systems and applications
  • Monitor for potential exploitation attempts
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-03T08:16:24.977Z and was last modified on 2026-07-08T18:25:07.617Z. The NVD entry is currently Analyzed. The vulnerability affects Apache Lucene.Net.Analysis.Common library versions 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. Evidence limits suggest verifying affected deployments and reviewing official advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47898 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47898

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47898 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47898

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.