What is CVE-2026-96421?

CVE-2026-96421 is a medium-severity vulnerability in Wireshark Foundation, classified under CWE-1325. CVSS score: 5.5/10. Published 2026-09-29.

How severe is CVE-2026-96421?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Wireshark Foundation

CVE-2026-96421

USB HID protocol dissector infinite loop and memory leak in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service

Published 2026-09-29 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (2.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Wireshark Foundation

Weakness classification (CWE)

CWE-1325

References

Frequently asked questions

What is CVE-2026-96421?: CVE-2026-96421 is a medium-severity vulnerability in Wireshark Foundation, classified under CWE-1325. CVSS score: 5.5/10. Published 2026-09-29.
How severe is CVE-2026-96421?: Medium severity. CVSS v3 base score is 5.5 out of 10.