CVE-2026-44508

Received Received - Intake

Integer Overflow in Rsync Leading to Memory Disclosure

Publication date: 2026-07-20

Last updated on: 2026-07-20

Assigner: GitHub, Inc.

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-20

Last Modified

2026-07-20

Generated

2026-07-21

AI Q&A

2026-07-21

EPSS Evaluated

N/A

NVD

CVE-2026-44508

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

Rsync before version 3.4.3 has a vulnerability in its compressed-token decoder where a 32-bit signed counter can overflow without checks. A malicious sender can exploit this to extract data from the process's memory, including environment variables, passwords, and memory pointers. This can reduce ASLR effectiveness and aid further attacks.

Detection Guidance

To detect this vulnerability, check the version of rsync installed on your system. Run 'rsync --version' and verify if it is prior to 3.4.3. If it is, the system is vulnerable.

Impact Analysis

An attacker could access sensitive data like passwords or environment variables from the rsync process. They might also bypass memory protections like ASLR, making it easier to execute further exploits on your system if you use a vulnerable rsync version.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles or HIPAA's confidentiality requirements. Organizations using vulnerable rsync versions may face compliance violations if data is exposed.

Mitigation Strategies

Immediately update rsync to version 3.4.3 or later. This can typically be done via your package manager, such as 'sudo apt-get update && sudo apt-get install rsync' for Debian-based systems or 'sudo yum update rsync' for RHEL-based systems.

Hi! I’m here to help you understand CVE-2026-44508. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70