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CVE-2026-53994

Description

A flaw was found in ProFTPD's mod_sftp module. An authenticated SFTP user can exploit a heap-based buffer overflow by sending a specially crafted SFTP packet with a zero-length value. This can lead to an unsigned integer underflow, causing the system to allocate a small memory block while expecting a much larger one. Consequently, an attacker can write beyond the allocated buffer, resulting in a reliable remote Denial of Service (DoS) by crashing the ProFTPD session. Depending on memory layout, further impacts such as arbitrary code execution may be possible.

Statement

Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.

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