CVE-2026-47897: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Apache Lucene.

This month

HIGH 7.5REMOTEWATCHLISTDOWNGRADE

CVE-2026-47897 is a high-severity flaw (CVSS 7.5) affecting lucene.net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Apache Lucene.Net (Lucene.Net.Replicator library). This issue affects Apache Lucene.Net.Replicator: 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.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-03
Last modified	2026-10-25

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-03 08:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

apache lucene.net DOWNGRADE

Affected: 4.8.0 beta00005 · 4.8.0 beta00006 · 4.8.0 beta00007 · 4.8.0 beta00008 · 4.8.0 beta00009 · 4.8.0 beta00010 · 4.8.0 beta00011 · 4.8.0 beta00012

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.8.0

1. Check installed version

apt-cache policy lucene.net || rpm -q lucene.net || lucene.net --version

2. No fixed release: DOWNGRADE to a release before 4.8.0 (Debian / Ubuntu)

apt-cache madison lucene.net sudo apt install lucene.net=<VERSION_BEFORE_4.8.0> sudo apt-mark hold lucene.net

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lucene.net sudo dnf downgrade lucene.net-<VERSION_BEFORE_4.8.0> sudo dnf versionlock add lucene.net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47897?

lucene.net: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47897 being exploited?

CVE-2026-47897 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47897 affect?

CVE-2026-47897 affects lucene.net. Severity is high (CVSS 7.5). Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Apache Lucene.Net (Lucene.Net.Replicator library). This issue affects Apache Lucene.Net.Replicator: from 4.8.0-beta00005 before 4.8.0-beta00018

How urgent is CVE-2026-47897?

Priority 50/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-47898 CRITICAL 9.8 DOWNGRADE Improper Restriction of XML External Entity Reference vulnerability in Apache Lucene.Net (Lucene.Net.Analysis.
CVE-2026-47896 HIGH 7.5 DOWNGRADE Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Apache Lucene.

References

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