CVE-2026-5402

Name: CVE-2026-5402
Creator: NVD / NIST
Published: 2026-04-30T07:16:37.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-5402 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.34%

25.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-122

Affected Software

Vendor	Product	Versions
Wireshark	Wireshark	>= 4.6.0, <= 4.6.4

References

https://gitlab.com/wireshark/wireshark/-/issues/21090Exploit, Issue Tracking
https://www.wireshark.org/security/wnpa-sec-2026-14.htmlVendor Advisory

Timeline

Published: Apr 30, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-5402?

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

How severe is CVE-2026-5402?

CVE-2026-5402 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5402?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-5402?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST