RsyncProject Rsync up to 3.4.4 max-alloc allocation of resources

Summaryinfo

A vulnerability, which was classified as problematic, was found in RsyncProject Rsync up to 3.4.4. This issue affects some unknown processing. The manipulation of the argument max-alloc results in allocation of resources. This vulnerability is known as CVE-2026-53794. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in RsyncProject Rsync up to 3.4.4. It has been classified as problematic. Affected is some unknown functionality. The manipulation of the argument max-alloc with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

rsync before 3.5.0 contains a logic error in --max-alloc handling that allows a sender or configuration setting --max-alloc=0 to disable allocation sanity checks entirely rather than enforcing a zero-byte cap. Attackers can exploit this flaw to cause the receiver to attempt unbounded memory allocations for file list and data structures, potentially exhausting available memory and causing a denial of service.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-53794 since 06/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 335065 (Linux Distros Unpatched Vulnerability : CVE-2026-53794), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.5.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (335065). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• File Transfer Software

Vendor

• RsyncProject

Name

• Rsync

Version

• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4

Website

• Product: https://github.com/RsyncProject/rsync/

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Once again VulDB remains the best source for vulnerability data.

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