What is CVE-2026-15165?

CVE-2026-15165 is a medium-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-07-08.

How severe is CVE-2026-15165?

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

Buffer overflow in Wireshark

CVE-2026-15165

TLS ECH decryptor crash in Wireshark 4.6.0 to 4.6.6 allows denial of service

Vulnerability class: Buffer Overflow

Published 2026-07-08 · last modified 2026-07-10.

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: 0.001 (2.9th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.9% 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: 0.001 · change: -0.000

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

gitlab.com/wireshark/wireshark/-/work_items/21390 (Exploit, Third Party Advisory, Issue Tracking)
www.wireshark.org/security/wnpa-sec-2026-56.html (Vendor Advisory)

Frequently asked questions

What is CVE-2026-15165?: CVE-2026-15165 is a medium-severity vulnerability in Wireshark, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-07-08.
How severe is CVE-2026-15165?: Medium severity. CVSS v3 base score is 5.5 out of 10.