CVE-2026-70459
Received Received - Intake

Null Pointer Dereference in rsync Daemon

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: VulnCheck

Description
rsync 3.0.0 before 3.5.0 contains a null pointer dereference vulnerability in the daemon child process that allows remote attackers to crash the daemon by sending a file list whose first entry is a dot entry not typed as a directory. The daemon dereferences the first file list entry as a directory structure pointer without verifying the entry type, resulting in an invalid or uninitialized pointer dereference that terminates the client connection.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-70459
EUVD
EUVD-2026-58045

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-908 The product uses or accesses a resource that has not been initialized.

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Executive Summary

CVE-2026-70459 is a null pointer dereference vulnerability in rsync versions 3.0.0 through 3.4.4. It occurs when a remote attacker sends a malformed file list to the rsync daemon where the first entry is a dot entry not explicitly typed as a directory. The daemon incorrectly dereferences an uninitialized pointer, causing a crash.

Detection Guidance

To detect this vulnerability, check if your rsync version is between 3.0.0 and 3.4.4. Run 'rsync --version' to see the installed version. If vulnerable, the daemon may crash when receiving a malformed file list with a dot entry not typed as a directory.

Impact Analysis

This vulnerability allows attackers to crash the rsync daemon by sending a specially crafted file list. This results in a denial of service (DoS) for the connection, preventing legitimate users from transferring files. The attack requires no authentication and can be executed remotely over a network.

Mitigation Strategies

Upgrade rsync to version 3.5.0 or later immediately. If upgrading is not possible, restrict access to rsync modules or disable anonymous writable modules to prevent exploitation.

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