CVE-2026-16599

A flaw was found in wget's FTP OPIE/S-KEY authentication functionality. A malicious FTP server or a network attacker can send a specially crafted OPIE challenge. This challenge contains a sequence number that, when processed by wget, can lead to an excessive number of cryptographic computations. This prolonged computation can cause wget to become unresponsive, resulting in a denial of service.

All versions of wget as shipped with Red Hat Enterprise Linux, Red Hat In-Vehicle Operating System, and Fedora are affected.

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.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.