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Wireshark CVE-2026-6869

| EUVDEUVD-2026-26347 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-2026-26347
Analysis Generated
Apr 30, 2026 - 06:30 vuln.today
CVE Published
Apr 30, 2026 - 05:33 nvd
MEDIUM 5.5

DescriptionCVE.org

WebSocket 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 versions 4.6.0-4.6.4 and 4.4.0-4.4.14 crash when processing malformed WebSocket protocol packets, enabling local denial of service. An attacker with the ability to trigger packet dissection-either by crafting a malicious PCAP file or intercepting traffic on a local network-can force the application to crash by supplying a WebSocket frame that triggers an unhandled error condition in the protocol dissector. The vulnerability requires user interaction (opening a file or navigating to a network interface) and operates at local scope, resulting in application unavailability rather than code execution.

Technical ContextAI

Wireshark's protocol dissectors are responsible for parsing and displaying network traffic in human-readable form. The WebSocket dissector parses frames according to RFC 6455, which defines binary frame structure including opcode, payload length encoding, and masking key handling. CWE-1325 (Imbalanced Resource Allocation Between Multiple Partitions) suggests the dissector fails to properly validate or handle edge cases in WebSocket frame parsing, such as oversized payloads, invalid opcode values, or malformed header fields. When such frames are encountered during live packet capture or offline PCAP file analysis, the dissector crashes rather than gracefully handling the error, terminating the Wireshark process and interrupting any ongoing traffic analysis.

RemediationAI

Upgrade Wireshark immediately to version 4.6.5 or later (for the 4.6 branch) or version 4.4.15 or later (for the 4.4 branch). Patched versions are available from the Wireshark Foundation at https://www.wireshark.org/security/wnpa-sec-2026-44.html. Until patching is possible, avoid opening untrusted PCAP files from unknown sources and configure network capture interfaces to filter traffic only to essential protocols, reducing exposure to malformed WebSocket frames. Additionally, disable the WebSocket dissector protocol plugin in Wireshark preferences if WebSocket inspection is not operationally required; this eliminates the code path triggering the crash. Note that disabling the dissector will prevent analysis of legitimate WebSocket traffic but eliminates the denial of service vector.

Same weakness CWE-1325 – Improperly Controlled Sequential Memory Allocation

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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-2026-6869 vulnerability details – vuln.today
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