What is CVE-2026-5657?

CVE-2026-5657 is a medium-severity vulnerability in Wireshark, classified under Double Free. CVSS score: 5.5/10. Published 2026-04-30.

How severe is CVE-2026-5657?

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

Double Free in Wireshark

CVE-2026-5657

iLBC codec crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

Vulnerability class: Double Free

Published 2026-04-30 · last modified 2026-06-17.

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: 0.003 (25.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.5% 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: 0.003 · change: +0.001

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

CWE-415 — Double Free

References

www.wireshark.org/security/wnpa-sec-2026-20.html (Vendor Advisory)
gitlab.com/wireshark/wireshark/-/issues/21113 (issue-tracking, Exploit, permissions-required, Third Party Advisory, Issue Tracking)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Issue Tracking, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5657?: CVE-2026-5657 is a medium-severity vulnerability in Wireshark, classified under Double Free. CVSS score: 5.5/10. Published 2026-04-30.
How severe is CVE-2026-5657?: Medium severity. CVSS v3 base score is 5.5 out of 10.