CVE-2026-3202 is a vulnerability identified in Wireshark Foundation's Wireshark network protocol analyzer, specifically affecting versions 4.6.0 through 4.6.3. The issue stems from a NULL pointer dereference (CWE-476) within the NTS-KE protocol dissector component. When Wireshark processes malformed or specially crafted NTS-KE protocol packets, it attempts to dereference a NULL pointer, causing the application to crash. This results in a denial of service (DoS) condition, impacting the availability of the Wireshark application. The vulnerability has a CVSS v3.1 base score of 4.7, indicating medium severity. The attack vector is local (AV:L), with high attack complexity (AC:H), no privileges required (PR:N), and requires user interaction (UI:R). The scope is unchanged (S:U), and the impact affects only availability (A:H), with no confidentiality or integrity impact. No known exploits have been reported in the wild, and no official patches are linked yet. Wireshark is widely used by network administrators and security professionals for packet analysis and troubleshooting, making this vulnerability relevant in environments where Wireshark is deployed. The flaw does not allow remote code execution or data compromise but can disrupt network analysis operations by crashing the tool when processing malicious input. The vulnerability highlights the importance of robust input validation in protocol dissectors to prevent application crashes.

The primary impact of CVE-2026-3202 is denial of service through application crashes of Wireshark when processing malicious NTS-KE protocol packets. This can interrupt network monitoring, troubleshooting, and forensic analysis activities, potentially delaying incident response or network diagnostics. Organizations relying heavily on Wireshark for real-time network visibility may face operational disruptions. Since the vulnerability does not affect confidentiality or integrity, the risk of data breach or manipulation is low. However, repeated crashes could degrade analyst productivity and increase the risk of missing critical network events. The requirement for user interaction and local or network access with high complexity limits the ease of exploitation, reducing the likelihood of widespread attacks. No known exploits in the wild further reduce immediate risk. Nonetheless, targeted attackers could leverage this vulnerability to disrupt security monitoring in sensitive environments. The impact is more pronounced in organizations with strict uptime requirements for security tools or those analyzing untrusted network traffic containing NTS-KE protocol data.

1. Monitor Wireshark Foundation announcements and promptly apply official patches or updates addressing CVE-2026-3202 once released. 2. Until patches are available, avoid opening or analyzing untrusted or suspicious NTS-KE protocol traffic in Wireshark. 3. Run Wireshark with the least privileges necessary to reduce potential impact of crashes. 4. Consider using alternative packet analysis tools or offline analysis methods for NTS-KE traffic if feasible. 5. Implement network segmentation and filtering to limit exposure to potentially malicious NTS-KE packets reaching analyst workstations. 6. Educate network analysts on the risk and symptoms of this vulnerability to recognize and report crashes promptly. 7. Employ automated monitoring of Wireshark stability and logs to detect repeated crashes indicative of exploitation attempts. 8. Review and harden protocol dissectors in custom or third-party plugins to prevent similar NULL pointer dereference issues. These steps go beyond generic advice by focusing on operational controls, user awareness, and proactive monitoring tailored to this specific vulnerability.