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Fencer Vulns
high 7.5

CVE-2026-76928 json

NULL Pointer Dereference in Wireshark

published 2026-08-19 2 mo ago modified 2026-08-31 2 mo ago also EUVD-2026-63166

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

X.509IF protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

Patch / fix

  • Wireshark Foundation Wireshark 4.4.18, 4.6.8
  • wireshark Debian 13 4.4.18-0+deb13u1
  • wireshark Debian 14 4.6.9-1

debian advisories DEBIAN-CVE-2026-76928

  • wireshark RHEL 10.2 1:4.4.2-10.el10_2.8
  • wireshark-cli RHEL 10.2 1:4.4.2-10.el10_2.8

red hat advisories RHSA-2026:84721

  • wireshark SLES for SAP applications 16.0, SLES 16.0 4.4.18-160000.1.1
  • wireshark SLE Module for Desktop Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.6.8-150700.21.14.1

suse advisories SUSE-SU-2026:24013-1SUSE-SU-2026:4379-1

  • wireshark openSUSE Leap 16.0 4.4.18-160000.1.1
  • wireshark openSUSE Tumbleweed 4.6.8-2.1

opensuse advisories openSUSE-SU-2026:22014-1openSUSE-SU-2026:11579-1

  • wireshark AlmaLinux 10 1:4.4.2-10.el10_2.8
  • wireshark-cli AlmaLinux 10 1:4.4.2-10.el10_2.8

almalinux advisories ALSA-2026:84721

  • wireshark Rocky Linux 10 1:4.4.2-10.el10_2.8

rocky linux advisories RLSA-2026:84721

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-76928 updated cvss 6.5

wireshark: Wireshark: Denial of Service via X.509IF protocol dissector crash

  • Red Hat Enterprise Linux AppStream (v. 10) wireshark 4.4.2-10.el10_2.8, wireshark-cli 4.4.2-10.el10_2.8 Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) wireshark-devel 4.4.2-10.el10_2.8, wireshark-debuginfo 4.4.2-10.el10_2.8, wireshark-debugsource 4.4.2-10.el10_2.8, wireshark-cli-debuginfo 4.4.2-10.el10_2.8
    fixed: vendor fix RHSA-2026:84721
  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome Red Hat Enterprise Linux 8 wireshark, wireshark-cli Red Hat Enterprise Linux 9 wireshark, wireshark-cli
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/work_items/21469 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.