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Wireshark CVE-2026-76879

| EUVDEUVD-2026-63177 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-08-19 GitLab GHSA-wjf3-82r2-8vvm
Stack Overflow Buffer Overflow Denial Of Service Wireshark Suse
7.5
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-delivered malformed C12.22 packets crash Wireshark without authentication or added interaction; impact is confined solely to availability of the analyzer process.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Aug 20, 2026 - 01:01 EUVD
Analysis Generated
Aug 19, 2026 - 23:23 vuln.today
CVE Published
Aug 19, 2026 - 22:44 cve.org
HIGH 7.5

DescriptionCVE.org

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

AnalysisAI

Wireshark's C12.22 protocol dissector crashes via a stack-based buffer overflow when processing malformed C12.22 packets, enabling unauthenticated remote denial of service against versions 4.4.0-4.4.18 and 4.6.0-4.6.7. An attacker who can inject crafted C12.22 traffic into a live capture session - or supply a malicious PCAP file - can crash the analyzer process, blinding the analyst to network activity. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify Wireshark analyst capturing C12.22 traffic
Delivery
Craft malformed C12.22 protocol packet
Exploit
Inject packet into captured network stream or deliver malicious PCAP file
Execution
Vulnerable dissector processes malformed input
Persist
Stack-based buffer overflow triggered in C12.22 dissector
Impact
Wireshark process crashes (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to be running a vulnerable version of Wireshark (4.4.0-4.4.18 or 4.6.0-4.6.7) with the C12.22 protocol dissector active - either performing a live packet capture on a network that carries C12.22/AMI traffic, or opening a crafted PCAP file containing malformed C12.22 packets. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H scores 7.5 and reflects unauthenticated, low-complexity network exploitation with no user interaction, but with impact strictly limited to availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with access to a network segment being captured by a Wireshark analyst - such as an internal adversary on an AMI network, or a network-adjacent attacker during a packet capture session - transmits a specially crafted C12.22 protocol packet. The malformed packet is processed by the vulnerable C12.22 dissector, triggering the stack-based buffer overflow and immediately crashing Wireshark, denying the analyst network visibility. …
Remediation Users should upgrade Wireshark to a patched release beyond 4.4.18 or 4.6.7 as documented in the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-89.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Wireshark instances and identify which are running affected versions (4.4.0-4.4.18 or 4.6.0-4.6.7), prioritizing systems used for C12.22 dissection or untrusted PCAP analysis. …

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Same weakness CWE-121 – Stack-based Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-76879 vulnerability details – vuln.today
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