CVE-2026-5402: Heap-based Buffer Overflow in Wireshark
Published Apr 30, 2026
·Updated
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
Affected Software
2 affected components
Wireshark Wireshark>=4.6.0<=4.6.4
Wireshark Wireshark>=4.6.0<=4.6.4
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Wiresharkto a version that resolves this vulnerability.Fixed in 4.6.5
Event History
Apr 30, 2026
CVE Published
via MITRE·05:39 AM
Data Sourced
via MITRE·05:39 AM
RemedyDescriptionSeverityWeakness
Data Sourced
via Red Hat·07:02 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·07:16 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-5402?
CVE-2026-5402 is classified as a high severity vulnerability due to the potential for denial of service and code execution.
2
How do I fix CVE-2026-5402?
To fix CVE-2026-5402, upgrade Wireshark to version 4.6.5 or later.
3
What type of vulnerability is CVE-2026-5402?
CVE-2026-5402 is a heap-based buffer overflow vulnerability.
4
What software versions are affected by CVE-2026-5402?
CVE-2026-5402 affects Wireshark versions 4.6.0 to 4.6.4.
5
Can CVE-2026-5402 lead to code execution?
Yes, CVE-2026-5402 can potentially lead to code execution alongside denial of service.