What is CVE-2026-9759?

CVE-2026-9759 is a medium-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2026-05-27.

How severe is CVE-2026-9759?

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

NULL pointer dereference in Wireshark

CVE-2026-9759

ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service

Published 2026-05-27 · 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: 0.001 (2.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Wireshark
Wireshark Foundation — versions 4.6.0, 4.4.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.wireshark.org/security/wnpa-sec-2026-51.html (Vendor Advisory)
gitlab.com/wireshark/wireshark/-/work_items/21243 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9759?: CVE-2026-9759 is a medium-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2026-05-27.
How severe is CVE-2026-9759?: Medium severity. CVSS v3 base score is 5.5 out of 10.