What’s Vulnerable › Vulnerabilities

CVE-2026-5402: Heap-based Buffer Overflow in Wireshark

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-30 · updated 2026-10-26
• Weakness: CWE-122

Description

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

Affected products

• Wireshark Foundation Wireshark: from 4.6.0 through 4.6.4

References

• https://gitlab.com/wireshark/wireshark/-/issues/21090
• https://www.wireshark.org/security/wnpa-sec-2026-14.html
• https://access.redhat.com/security/cve/CVE-2026-5402
• https://bugzilla.redhat.com/show_bug.cgi?id=2464038
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5402.json

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