CVE-2025-5449

A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.

The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it is only exploitable on 32-bit systems by authenticated users with SFTP access. The issue stems from an integer overflow in packet length validation that causes excessive memory allocation attempts, leading to a crash in the SFTP server. While the flaw does not enable memory corruption or code execution, it can disrupt availability for legitimate users.

No Red Hat products or offerings are affected by this vulnerability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.