RsyncProject rsync up to 3.4.2 Decoder integer overflow

Summaryinfo

A vulnerability described as problematic has been identified in RsyncProject rsync up to 3.4.2. Impacted is an unknown function of the component Decoder. Executing a manipulation can lead to integer overflow. This vulnerability is registered as CVE-2026-44508. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in RsyncProject rsync up to 3.4.2. It has been declared as problematic. This vulnerability affects an unknown code block of the component Decoder. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality. CVE summarizes:

Rsync is a file-copying tool that uses a delta-transfer algorithm to synchronize remote and local files. In versions prior to 3.4.3, the receiver's compressed-token decoder accumulated a 32-bit signed counter without checking for overflow. A malicious sender can trigger an overflow that with careful manipulation can lead to the extraction of data stored in memory of the process allowing an attacker to access environment variables, passwords and memory pointers from the heap, stack, and libraries. The leakage of these pointers and data can significantly reduce the effectiveness of ASLR and facilitate further exploitation. This issue is fixed in version 3.4.3.

The advisory is available at github.com. This vulnerability was named CVE-2026-44508 since 05/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 3.4.3 eliminates this vulnerability.

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Productinfo

Type

• File Transfer Software

Vendor

• RsyncProject

Name

• rsync

Version

• 3.4.0
• 3.4.1
• 3.4.2

Website

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

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