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Wireshark EUVDEUVD-2026-26340

| CVE-2026-6533 MEDIUM
Improperly Controlled Sequential Memory Allocation (CWE-1325)
2026-04-30 GitLab
Denial Of Service Red Hat Wireshark Suse Wireshark Foundation
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

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 - 18:16 nvd
Patch available
Patch available
Apr 30, 2026 - 08:16 EUVD
Analysis Generated
Apr 30, 2026 - 06:47 vuln.today
EUVD ID Assigned
Apr 30, 2026 - 06:30 euvd
EUVD-2026-26340
Analysis Generated
Apr 30, 2026 - 06:30 vuln.today
CVE Published
Apr 30, 2026 - 05:36 nvd
MEDIUM 5.5

DescriptionCVE.org

Dissection engine LZ77 decompression crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

AnalysisAI

Denial of service in Wireshark 4.6.0-4.6.4 and 4.4.0-4.4.14 allows local attackers to crash the application by triggering an unhandled exception in the LZ77 decompression engine when processing malformed compressed packet data. The vulnerability requires user interaction (opening a crafted packet capture file or receiving a malicious packet) but causes immediate application termination, impacting network analysis workflows.

Technical ContextAI

The vulnerability exists in Wireshark's dissection engine, which parses and displays network packet contents in real time. The LZ77 compression algorithm is a lossless data compression method used in protocols and packet payloads (ZIP, gzip, PNG, and others). CWE-1325 describes improper control of an iterable loop without a termination condition, suggesting the decompression logic fails to validate decompression state or detect malformed compressed streams, leading to an unhandled exception or infinite loop that exhausts system resources. The affected versions span two release branches: the 4.6.x stable series and the older 4.4.x legacy series, indicating the flaw was present across multiple code bases or shared decompression library.

RemediationAI

Upgrade Wireshark to version 4.6.5 or later (to patch 4.6.x branch) or 4.4.15 or later (to patch 4.4.x branch). Users on unsupported versions should migrate to the latest stable release. As a temporary workaround, avoid opening untrusted packet capture files (.pcap, .pcapng) from unknown sources until patching. If you must analyze potentially malicious captures, run Wireshark in an isolated virtual machine or container to limit the blast radius of a crash. Disable real-time packet capture in environments where users are not trained to expect application crashes from malformed packets. Consult https://www.wireshark.org/security/wnpa-sec-2026-28.html for patch release dates and confirmation of fix versions.

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Same weakness CWE-1325 – Improperly Controlled Sequential Memory Allocation

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CVE-2025-13945 MEDIUM POC
5.5
CVE-2026-3201 MEDIUM POC
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7.8
CVE-2025-2240 HIGH
7.5
CVE-2026-34183 HIGH
7.5
CVE-2021-43174 HIGH
7.5
CVE-2026-13056 HIGH
7.1
CVE-2026-8199 HIGH
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

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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EUVD-2026-26340 vulnerability details – vuln.today
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