Buffer overflow in Wireshark

CVE-2026-0959

IEEE 802.11 protocol dissector crash in Wireshark 4.6.0 to 4.6.2 and 4.4.0 to 4.4.12 allows denial of service

Vulnerability class: Buffer Overflow

EPSS: 0.002 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@gitlab.com (Vendor Advisory)
cve@gitlab.com (issue-tracking, permissions-required, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0959?: CVE-2026-0959 is a medium-severity vulnerability in Wireshark, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-01-14.
How severe is CVE-2026-0959?: Medium severity. CVSS v3 base score is 5.3 out of 10.