What is CVE-2026-76879?

CVE-2026-76879 is a high-severity vulnerability in Wireshark, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-08-19.

How severe is CVE-2026-76879?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Wireshark

CVE-2026-76879

C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

Vulnerability class: Buffer Overflow

Published 2026-08-19 · last modified 2026-09-01.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

www.wireshark.org/security/wnpa-sec-2026-89.html (Vendor Advisory)
gitlab.com/wireshark/wireshark/-/work_items/21480 (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-76879?: CVE-2026-76879 is a high-severity vulnerability in Wireshark, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-08-19.
How severe is CVE-2026-76879?: High severity. CVSS v3 base score is 7.5 out of 10.