Bug 2540010 (CVE-2026-79680)

Summary: CVE-2026-79680 qtvncserver: Qt VNC Server: Authentication bypass via RFB protocol violation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Qt VNC Server module. A remote attacker, by using a specially modified VNC client that violates the Remote Framebuffer (RFB) protocol, can bypass the password authentication mechanism. This allows the attacker to gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-24 11:01:23 UTC
Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module. An attacker using a specially modified VNC client that violates the RFB protocol can bypass Qt VNC Server's password authentication and gain unauthorized remote access to the shared application, compromising the confidentiality and integrity of the session.