What is CVE-2026-3203?

CVE-2026-3203 is a medium-severity vulnerability in Wireshark, classified under Buffer Over-read. CVSS score: 5.5/10. Published 2026-02-25.

How severe is CVE-2026-3203?

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

Vulnerability in Wireshark

CVE-2026-3203

RF4CE Profile protocol dissector crash in Wireshark 4.6.0 to 4.6.3 and 4.4.0 to 4.4.13 allows denial of service

Published 2026-02-25 · last modified 2026-06-17.

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: 0.003 (16.5th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

www.wireshark.org/security/wnpa-sec-2026-07.html (Vendor Advisory)
GitLab Issue #21009 (issue-tracking, permissions-required, Issue Tracking)

Frequently asked questions

What is CVE-2026-3203?: CVE-2026-3203 is a medium-severity vulnerability in Wireshark, classified under Buffer Over-read. CVSS score: 5.5/10. Published 2026-02-25.
How severe is CVE-2026-3203?: Medium severity. CVSS v3 base score is 5.5 out of 10.