Buffer overflow in Wireshark

CVE-2026-0961

BLF file parser 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 (7.1th percentile) — read the EPSS interpretation.

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.

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, Exploit, permissions-required, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0961?: CVE-2026-0961 is a medium-severity vulnerability in Wireshark, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-01-14.
How severe is CVE-2026-0961?: Medium severity. CVSS v3 base score is 5.5 out of 10.