# CVE-2026-47896: Apache Lucene.Net: Unauthenticated arbitrary file read on the Lucene.Net.Replicator replication server

> An unauthenticated attacker can read arbitrary files from the server via path traversal in the Lucene.Net.Replicator library.

- **Severity:** High 8.9 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y/RE:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jul 2026
- **Updated:** 6 Jul 2026
- **Also known as:** GHSA-mggp-f2j5-mm3g

## What is CVE-2026-47896?

CVE-2026-47896 is a high-severity path traversal vulnerability in Apache Lucene.Net, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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 through 4.8.0-beta00017.

Users are recommended to upgrade to version 4.8.0-beta00018, which fixes the issue.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-47896?

It affects 1 product.


Products: Apache Lucene.net.

## How do I fix CVE-2026-47896?

No fix has been published for CVE-2026-47896 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-47896 being exploited?

There is no known exploitation of CVE-2026-47896 in the wild and no public exploit code.

## Other vulnerabilities in Apache Lucene.Net

- [CVE-2026-47897](https://insights.sbomify.com/CVE-2026-47897/): Apache Lucene.Net: Arbitrary file write from malicious server to Lucene.Net.Replicator client (high 8.9)
- [CVE-2024-43383](https://insights.sbomify.com/CVE-2024-43383/): Apache Lucene.Net.Replicator: Remote Code Execution in Lucene.Net.Replicator (high 8.0)
- [CVE-2026-47898](https://insights.sbomify.com/CVE-2026-47898/): Apache Lucene.Net: XXE vulnerability in Lucene.Net.Analysis.Common PatternParser (medium 4.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47896 and fix it if it is affected.

What it is: CVE-2026-47896 is a high-severity path traversal vulnerability in Apache Lucene.Net, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-47896 in the wild and no public exploit code.

Affected product: Apache Lucene.Net. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-47896/ (Markdown: https://insights.sbomify.com/CVE-2026-47896/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47896
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47896
- OSV: https://osv.dev/vulnerability/CVE-2026-47896

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-47896/
Summaries are generated and may contain mistakes; the official description above is the record.