CVE-2026-57965 Red Hat CVE debrief

Who should care

Administrators and users of virtual machines that utilize the spice-vdagent should be aware of this vulnerability. This includes organizations that rely on SPICE for remote access to virtual machines. Given the MEDIUM severity and the requirement for the SPICE host to be untrusted or compromised, attention is needed to ensure that the SPICE host is properly secured.

Technical summary

The CVE-2026-57965 vulnerability is caused by an integer overflow in the spice-vdagent. This occurs when a malicious or compromised SPICE host sends a specially crafted message. The integer overflow leads to a heap buffer overflow, causing the spice-vdagent daemon to crash. This results in a Denial of Service (DoS) for the virtual machine. The vulnerability's CVSS vector is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H, indicating a MEDIUM severity with a score of 5.1. The CWE associated with this vulnerability is CWE-190, which refers to Integer Overflow or Wraparound.

Defensive priority

Given the MEDIUM severity of CVE-2026-57965 and the requirement for the SPICE host to be untrusted or compromised for exploitation, defenders should prioritize securing the SPICE host and monitoring for suspicious activity. Ensuring that the SPICE host is properly secured and that the spice-vdagent is up-to-date are crucial defensive measures.

Recommended defensive actions

• Update spice-vdagent to the latest version to patch the vulnerability
• Ensure that the SPICE host is properly secured and monitored for suspicious activity
• Implement additional security measures to prevent the SPICE host from being compromised
• Regularly review and update virtual machine configurations to ensure they are secure
• Monitor for and respond to potential Denial of Service (DoS) attacks

Evidence notes

The CVE-2026-57965 vulnerability was identified in the spice-vdagent. The vulnerability allows a malicious or compromised SPICE host to trigger an integer overflow by sending a specially crafted message. This leads to a heap buffer overflow and causes the spice-vdagent daemon to crash, resulting in a Denial of Service (DoS) for the virtual machine. The CVE has a CVSS score of 5.1 and is classified as MEDIUM severity. The CWE associated with this vulnerability is CWE-190. The information provided is based on the available data and may not be comprehensive; further investigation may be necessary to fully understand the vulnerability's impact.

Official resources