Skip to content
Fencer Vulns
medium 5.3

CVE-2026-76919 json

Use of Uninitialized Variable in Wireshark

published 2026-08-19 2 mo ago modified 2026-09-17 52 d ago also EUVD-2026-63173

cvss
5.3
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

ESS 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-2026-76919

  • 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
  • wireshark RHEL 8 1:2.6.2-21.el8_10
  • wireshark-cli RHEL 8 1:2.6.2-21.el8_10
  • wireshark RHEL 9 1:3.4.10-9.el9_8.5
  • wireshark-cli RHEL 9 1:3.4.10-9.el9_8.5

red hat advisories RHSA-2026:84721RHSA-2026:83657RHSA-2026:83546

  • 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
  • wireshark AlmaLinux 9 1:3.4.10-9.el9_8.5
  • wireshark-cli AlmaLinux 9 1:3.4.10-9.el9_8.5
  • wireshark AlmaLinux 8 1:2.6.2-21.el8_10
  • wireshark-cli AlmaLinux 8 1:2.6.2-21.el8_10

almalinux advisories ALSA-2026:84721ALSA-2026:83546ALSA-2026:83657

  • wireshark Rocky Linux 10 1:4.4.2-10.el10_2.8
  • wireshark Rocky Linux 9 1:3.4.10-9.el9_8.5
  • wireshark Rocky Linux 8 1:2.6.2-21.el8_10

rocky linux advisories RLSA-2026:84721RLSA-2026:83546RLSA-2026:83657

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-2026-76919 updated cvss 6.5

wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector

  • Red Hat Enterprise Linux 6 wireshark, wireshark-gnome
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 wireshark, wireshark-gnome
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) wireshark 2.6.2-21.el8_10, wireshark-cli 2.6.2-21.el8_10
    fixed: vendor fix RHSA-2026:83657
  • Red Hat Enterprise Linux AppStream (v. 9) wireshark 3.4.10-9.el9_8.5, wireshark-cli 3.4.10-9.el9_8.5
    fixed: vendor fix RHSA-2026:83546
  • Red Hat Enterprise Linux AppStream (v. 10) wireshark 4.4.2-10.el10_2.8, wireshark-cli 4.4.2-10.el10_2.8
    fixed: vendor fix RHSA-2026:84721
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) wireshark-devel 3.4.10-9.el9_8.5, wireshark-debuginfo 3.4.10-9.el9_8.5, wireshark-debugsource 3.4.10-9.el9_8.5, wireshark-cli-debuginfo 3.4.10-9.el9_8.5
    fixed: vendor fix RHSA-2026:83546
  • 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 CRB (v. 8) wireshark-devel 2.6.2-21.el8_10, wireshark-debuginfo 2.6.2-21.el8_10, wireshark-debugsource 2.6.2-21.el8_10, wireshark-cli-debuginfo 2.6.2-21.el8_10
    fixed: vendor fix RHSA-2026:83657

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
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.31% 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/21467 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 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
  • CWE-457 Use of Uninitialized Variable

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.