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Wireshark CVE-2026-6535

| EUVDEUVD-2026-26342 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 - 18:16 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-2026-26342
Analysis Generated
Apr 30, 2026 - 06:30 vuln.today
CVE Published
Apr 30, 2026 - 05:36 nvd
MEDIUM 5.5

DescriptionCVE.org

Dissection engine zlib 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 causes application crash during zlib decompression in the packet dissection engine when processing malformed compressed traffic. Local attackers with user privileges can trigger the crash by opening a specially crafted pcap file or receiving a malicious packet capture, requiring user interaction but no authentication. No public exploit code or active exploitation has been identified at time of analysis.

Technical ContextAI

The vulnerability exists in Wireshark's packet dissection engine, specifically in the zlib decompression routine used to decode compressed payloads (such as HTTP/gzip content or other zlib-compressed protocols). The affected CPE cpe:2.3:a:wireshark_foundation:wireshark indicates the official Wireshark application from the Wireshark Foundation. CWE-1325 (Improper Control of Dynamically-Managed Code Resources) suggests the crash stems from improper handling of decompressed data or memory during the zlib decompression process, likely triggered when the engine encounters malformed compression headers or oversized/invalid decompression output that violates expected constraints.

RemediationAI

Upgrade to Wireshark 4.6.5 or later (for the 4.6.x branch) or to Wireshark 4.4.15 or later (for the 4.4.x branch). The vendor has released patched versions addressing the zlib decompression crash. Users unable to upgrade immediately should avoid opening pcap files or packet captures from untrusted or suspicious sources, and restrict Wireshark usage to isolated or air-gapped networks if possible. If automation processes feed external pcap files to Wireshark, implement input validation or sandboxing (e.g., run Wireshark in a container or virtual machine) to limit exposure to denial of service. Consult https://www.wireshark.org/security/wnpa-sec-2026-26.html for additional mitigation guidance from the vendor.

Same weakness CWE-1325 – Improperly Controlled Sequential Memory Allocation

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CVE-2026-34183 HIGH
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CVE-2021-43174 HIGH
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CVE-2026-13056 HIGH
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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
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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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-2026-6535 vulnerability details – vuln.today
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