What is CVE-2026-76887?

CVE-2026-76887 is a low-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 3.1/10. Published 2026-08-19.

How severe is CVE-2026-76887?

Low severity. CVSS v3 base score is 3.1 out of 10.

Buffer overflow in Wireshark

CVE-2026-76887

Crash in the Wireshark dissection engine 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 2026-08-31.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.002 (6.4th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.4% 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: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

www.wireshark.org/security/wnpa-sec-2026-69.html (Vendor Advisory)
gitlab.com/wireshark/wireshark/-/work_items/21423 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-76887?: CVE-2026-76887 is a low-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 3.1/10. Published 2026-08-19.
How severe is CVE-2026-76887?: Low severity. CVSS v3 base score is 3.1 out of 10.