CVE-2026-5402: wireshark foundation wireshark Heap-based Buffer Overflow

Vulnerability summary

CVE-2026-5402 is a high (CVSS 8.8) Heap-based Buffer Overflow vulnerability in wireshark foundation wireshark. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.6% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 30-04-2026
   PublishedVulnerability first disclosed.
2. 15-07-2026
   Last modifiedVulnerability information updated.

Description

TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().