This vulnerability (CVE-2026-6536) in Wireshark Foundation's Wireshark product affects versions 4.6.0 through 4.6.4. It is caused by an infinite loop in the DLMS/COSEM protocol dissector due to a loop with an unreachable exit condition (CWE-835). The issue leads to a denial of service by causing the application to hang when processing certain malformed packets. The CVSS 3.1 base score is 5.5 (medium severity), with attack vector local, low attack complexity, no privileges required, user interaction required, scope unchanged, and impact limited to availability. No patch or official fix has been documented in the provided data.

The vulnerability impacts availability by causing Wireshark to enter an infinite loop and become unresponsive when processing specially crafted DLMS/COSEM protocol packets. There is no impact on confidentiality or integrity. This can disrupt network analysis activities but does not lead to data leakage or unauthorized modification.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch is documented, users should avoid processing untrusted or malformed DLMS/COSEM protocol traffic with affected Wireshark versions. Monitor Wireshark Foundation advisories for updates and patches addressing this issue.