Wireshark TLS Dissector Heap Overflow Vulnerability

CVE-2026-5402 is a heap buffer overflow in Wireshark's TLS protocol dissector affecting versions 4.6.0 through 4.6.4. This vulnerability allows attackers to trigger denial of service conditions and potentially execute arbitrary code by crafting malicious TLS traffic that overflows memory during packet analysis. Network security teams, incident responders, and anyone using Wireshark to inspect encrypted traffic are at risk—particularly those analyzing untrusted network captures or running Wireshark on systems processing live traffic from potentially hostile sources. The vulnerability's high CVSS score of 8.8 reflects the combination of remote exploitability, low attack complexity, and potential for code execution.

While this CVE currently maps to zero Casky skills and has no MITRE ATT&CK techniques assigned, the underlying attack pattern relates to memory corruption exploitation—a foundational technique for payload delivery and code execution. Practitioners using Casky's Claude AI-powered analysis would benefit from its extended reasoning capabilities to detect anomalous TLS packet structures that deviate from RFC specifications, identify suspicious dissector behavior patterns (such as unusual resource consumption or crashes during packet processing), and correlate these signals with known memory safety issues. Organizations should prioritize upgrading Wireshark beyond 4.6.4 and consider implementing network segmentation to limit exposure when analyzing untrusted packet captures, while monitoring for exploitation attempts through behavioral analysis of Wireshark process anomalies.