# CVE-2024-12086: Rsync: rsync server leaks arbitrary client files

> A malicious rsync server can reconstruct arbitrary client file contents byte-by-byte during upload operations, leading to sensitive data exposure.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 14 Jan 2025
- **Updated:** 21 Aug 2026
- **Also known as:** ALPINE-CVE-2024-12086, AZL-55661, AZL-55685, BELL-CVE-2024-12086, CLSA-2026-1776873915, DEBIAN-CVE-2024-12086, GHSA-82c6-8mfc-c23h, JLSEC-2025-325, UBUNTU-CVE-2024-12086

## What is CVE-2024-12086?

CVE-2024-12086 is a medium-severity vulnerability in Gentoo Linux, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A flaw was found in rsync. It could allow a server to enumerate the contents of an arbitrary file from the client's machine. This issue occurs when files are being copied from a client to a server. During this process, the rsync server will send checksums of local data to the client to compare with in order to determine what data needs to be sent to the server. By sending specially constructed checksum values for arbitrary files, an attacker may be able to reconstruct the data of those files byte-by-byte based on the responses from the client.

Weakness: CWE-390 (Detection of Error Condition Without Action)

## Which versions are affected by CVE-2024-12086?

It affects 9 products.


Products: Almalinux Almalinux, Archlinux Arch Linux, Gentoo Linux, Nixos Nixos, Redhat Enterprise Linux, Redhat Openshift Container Platform, Samba Rsync, Suse Suse Linux, Tritondatacenter Smartos.

## How do I fix CVE-2024-12086?

Apply the vendor's patch.

## Is CVE-2024-12086 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-12086 exists.

## Other vulnerabilities in Gentoo Linux

- [CVE-2024-12084](https://insights.sbomify.com/CVE-2024-12084/): Rsync: heap buffer overflow in rsync due to improper checksum length handling (critical 9.8)
- [CVE-2024-6387](https://insights.sbomify.com/CVE-2024-6387/): Openssh: regresshion - race condition in ssh allows rce/dos (high 8.1)
- [CVE-2024-12085](https://insights.sbomify.com/CVE-2024-12085/): Rsync: info leak via uninitialized stack contents (high 7.5)
- [CVE-2024-12087](https://insights.sbomify.com/CVE-2024-12087/): Rsync: path traversal vulnerability in rsync (medium 6.5)
- [CVE-2024-12088](https://insights.sbomify.com/CVE-2024-12088/): Rsync: --safe-links option bypass leads to path traversal (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-12086 and fix it if it is affected.

What it is: CVE-2024-12086 is a medium-severity vulnerability in Gentoo Linux, published on 14 Jan 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-12086 exists.

Affected product: Gentoo Linux. 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-2024-12086/ (Markdown: https://insights.sbomify.com/CVE-2024-12086/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-12086
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-12086
- OSV: https://osv.dev/vulnerability/CVE-2024-12086

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-12086/
Summaries are generated and may contain mistakes; the official description above is the record.