Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2026-76886: 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

46
This week
HIGH 8.1REMOTEUPGRADE

CVE-2026-76886 is a high-severity flaw (CVSS 8.1) affecting wireshark. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

  • High severity
  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score8.1 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 69%)
CISA exploited listNo
WeaknessCWE-122
Published2026-08-19
Last modified2026-10-23
Publisher (CNA): GitLab Inc. · Vendor: wireshark

Am I affected?

Timeline

wireshark wireshark UPGRADE
Affected: >= 4.4.0 and < 4.4.18 · >= 4.6.0 and < 4.6.8
Fixed in: 4.4.18, 4.6.8
Safe to downgrade to: a release before 4.4.0
1. Check installed version
apt-cache policy wireshark || rpm -q wireshark || wireshark --version
2. UPGRADE to 4.4.18 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade wireshark
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade wireshark
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 4.4.0 (Debian / Ubuntu)
apt-cache madison wireshark sudo apt install wireshark=<VERSION_BEFORE_4.4.0> sudo apt-mark hold wireshark
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list wireshark sudo dnf downgrade wireshark-<VERSION_BEFORE_4.4.0> sudo dnf versionlock add wireshark
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source
sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2
Debian 12 · wireshark · NO FIX YET
Debian 13 · wireshark · FIXED · 4.4.18-0+deb13u1
sudo apt update && sudo apt install --only-upgrade wireshark dpkg --compare-versions "$(dpkg-query -W -f='${Version}' wireshark)" ge "4.4.18-0+deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · wireshark · FIXED · wireshark-4.4.2-10.el10_2.8
sudo dnf upgrade --advisory=RHSA-2026:84721 rpm -q wireshark
RHEL 8 · wireshark · FIXED · wireshark-2.6.2-21.el8_10
sudo dnf upgrade --advisory=RHSA-2026:83657 rpm -q wireshark
RHEL 9 · wireshark · FIXED · wireshark-3.4.10-9.el9_8.5
sudo dnf upgrade --advisory=RHSA-2026:83546 rpm -q wireshark
RHEL 6 · wireshark · DEFERRED
RHEL 7 · wireshark · NO FIX YET
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2117 · source
sudo dnf update --advisory=ALAS2023-2026-2117
Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3905 · source
sudo yum update --advisory=ALAS2-2026-3905

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Advisories and coverage

Official advisories

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

References

← Back to latest CVEs