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Wireshark CVE-2026-6867

| EUVDEUVD-2026-26346 MEDIUM
Improperly Controlled Sequential Memory Allocation (CWE-1325)
2026-04-30 GitLab
Denial Of Service Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

6
Patch released
May 01, 2026 - 18:15 nvd
Patch available
Patch available
Apr 30, 2026 - 08:16 EUVD
Analysis Generated
Apr 30, 2026 - 06:45 vuln.today
EUVD ID Assigned
Apr 30, 2026 - 06:30 euvd
EUVD-2026-26346
Analysis Generated
Apr 30, 2026 - 06:30 vuln.today
CVE Published
Apr 30, 2026 - 05:33 nvd
MEDIUM 5.5

DescriptionCVE.org

SMB2 protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

AnalysisAI

Wireshark SMB2 protocol dissector crashes when processing malformed packets, causing denial of service in versions 4.6.0-4.6.4 and 4.4.0-4.4.14. A local attacker with low privileges can trigger the crash by crafting a malicious SMB2 packet and inducing the user to open it in Wireshark, resulting in application termination and loss of packet capture capability. No public exploit code or active exploitation in the wild has been identified at the time of analysis.

Technical ContextAI

Wireshark is a widely-used network protocol analyzer that dissects and displays network traffic in real-time. The SMB2 (Server Message Block version 2) dissector is a plugin that parses SMB2 protocol frames for analysis. The vulnerability stems from improper input validation in the SMB2 dissector when processing malformed or unexpected packet structures, classified under CWE-1325 (Improper Validation of Specified Quantity in Input). This causes a memory safety issue or logic error that crashes the dissector process rather than gracefully handling invalid data.

RemediationAI

Upgrade to Wireshark 4.6.5 or later (stable series) or 4.4.15 or later (legacy series) to receive the vendor-released patch. Confirm the update from the official Wireshark website (wireshark.org) rather than third-party sources. Until patching is possible, disable or remove the SMB2 dissector plugin from the Wireshark installation directory if SMB2 analysis is not required; this prevents the crash code path from being reached but sacrifices SMB2 traffic visibility. Alternatively, isolate packet analysis to an air-gapped analysis system and avoid opening untrusted .pcap or .pcapng files from external sources until updated. Do not rely on network segmentation or firewall rules, as this is a local/user-interaction vulnerability and does not require network access.

Same weakness CWE-1325 – Improperly Controlled Sequential Memory Allocation

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Same technique Denial Of Service

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-6867 vulnerability details – vuln.today
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