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Fencer Vulns
high 8.1

CVE-2026-76886 json

Heap-based Buffer Overflow in Wireshark

published 2026-08-19 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-63142

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

C12.22 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-2026-76886

  • 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-2026-76886 updated cvss 5.3

wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash

  • 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
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/work_items/21446 referenced PoC, tagged "exploit" by a source, unverified
  • gitlab.com https://gitlab.com/wireshark/wireshark/-/work_items/21439 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Wireshark Foundation Wireshark

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

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.