CVE-2026-0719

A flaw was identified in the NTLM authentication handling of the libsoup HTTP library, used by GNOME and other applications for network communication. When processing extremely long passwords, an internal size calculation can overflow due to improper use of signed integers. This results in incorrect memory allocation on the stack, followed by unsafe memory copying. As a result, applications using libsoup may crash unexpectedly, creating a denial-of-service risk.

The Red Hat Product Security team has assessed this vulnerability as Important severity due to its remote exploitability and lack of authentication requirements. Successful exploitation allows an attacker to crash any client or service using libsoup’s NTLM authentication mechanism. The root cause is improper handling of signed integer arithmetic, which leads to stack buffer overflow and denial-of-service.

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.