RsyncProject Rsync up to 3.4.4 Read-Only Daemon add_implied_include heap-based overflow

Summaryinfo

A vulnerability was found in RsyncProject Rsync up to 3.4.4. It has been rated as critical. The impacted element is the function add_implied_include of the component Read-Only Daemon Module. The manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2026-70461. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in RsyncProject Rsync up to 3.4.4. It has been rated as critical. This issue affects the function add_implied_include of the component Read-Only Daemon Module. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is integrity, and availability. The summary by CVE is:

rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of a heap allocation by supplying a crafted files-from entry. Attackers can trigger the vulnerability against a read-only rsync daemon module by providing a files-from entry containing both an interior and trailing backslash, causing the add_implied_include() function to under-count the trailing backslash when sizing the destination buffer.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-70461 since 08/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.5.0 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
• 3.4.3
• 3.4.4

Website

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

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