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Wireshark CVE-2026-96421

| EUVDEUVD-2026-88709 MEDIUM
Improperly Controlled Sequential Memory Allocation (CWE-1325)
2026-09-29 GitLab GHSA-wg4g-83vx-mw68
Denial Of Service Red Hat Wireshark Suse Wireshark Foundation
5.5
CVSS 3.1 · Vendor: GitLab
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Severity by source

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

Local because the victim must open a crafted file (UI:R); no privileges needed (PR:N); impact is a recoverable process hang/OOM only, so C:N/I:N/A:H.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Sep 29, 2026 - 11:01 EUVD
Analysis Generated
Sep 29, 2026 - 10:08 vuln.today
CVE Published
Sep 29, 2026 - 09:31 cve.org
MEDIUM 5.5

DescriptionCVE.org

USB HID protocol dissector infinite loop and memory leak in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service

AnalysisAI

Denial of service in Wireshark 4.6.0-4.6.8 and 4.4.0-4.4.18 allows attackers to hang or exhaust memory in the Wireshark process by getting a user to open a crafted capture file containing malformed USB HID data. The flaw is an infinite loop and memory leak in the USB HID protocol dissector (CWE-1325); exploitation requires user interaction to load the file and cannot cause code execution or data disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a user to open or process a crafted capture file (or malformed USB HID packet data) in an affected Wireshark build (4.6.0-4.6.8 or 4.4.0-4.4.18); the malicious data must reach the USB HID protocol dissector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuinely low-to-moderate priority issue whose CVSS 5.5 (Medium) is driven entirely by availability impact under a local attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor fix from Wireshark advisory wnpa-sec-2026-103 (https://www.wireshark.org/security/wnpa-sec-2026-103.html); the provided data does not specify an exact fixed version, so upgrade to the newest available 4.6.x or 4.4.x release and confirm with the advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-1325 – Improperly Controlled Sequential Memory Allocation

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 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-2026-96421 vulnerability details – vuln.today
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