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Wireshark CVE-2026-5405

HIGH
Heap-based Buffer Overflow (CWE-122)
2026-04-30 GitLab
RCE Denial Of Service Buffer Overflow Heap Overflow Wireshark
7.8
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

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

Lifecycle Timeline

3
Analysis Generated
Apr 30, 2026 - 23:45 vuln.today
Analysis Generated
Apr 30, 2026 - 23:30 vuln.today
CVE Published
Apr 30, 2026 - 23:03 nvd
HIGH 7.8

DescriptionCVE.org

RDP protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service and possible code execution

AnalysisAI

Heap-based buffer overflow in Wireshark's RDP protocol dissector allows local attackers to cause denial of service or execute arbitrary code via maliciously crafted capture files. Affects Wireshark versions 4.6.0-4.6.4 and 4.4.0-4.4.14. The vulnerability requires user interaction (opening a malicious .pcap file) but no authentication, making it effective for social engineering attacks against network analysts. No active exploitation confirmed in CISA KEV, but proof-of-concept details available via GitLab issue tracker. EPSS data not available for risk prioritization.

Technical ContextAI

The vulnerability resides in Wireshark's RDP (Remote Desktop Protocol) packet dissector, a component responsible for parsing and analyzing RDP traffic in network captures. The root cause is CWE-122 (Heap-based Buffer Overflow), occurring when the dissector improperly validates RDP packet data while processing capture files. As a packet analysis tool written primarily in C/C++, Wireshark's dissectors directly parse untrusted network data, making them high-risk attack surfaces. The CPE identifier confirms the Wireshark Foundation's network protocol analyzer as the affected product. Heap overflows in dissectors are particularly dangerous because they can corrupt memory management structures, potentially leading to arbitrary code execution within Wireshark's process context with the privileges of the user running the application.

RemediationAI

Upgrade to Wireshark version 4.6.5 or later for the 4.6.x branch, or version 4.4.15 or later for the 4.4.x branch as documented in security advisory wnpa-sec-2026-17 at https://www.wireshark.org/security/wnpa-sec-2026-17.html. Until patching is possible, implement compensating controls: disable the RDP dissector via Analyze → Enabled Protocols menu and uncheck RDP, preventing the vulnerable code path from executing (trade-off: inability to analyze RDP traffic). For high-security environments, process untrusted capture files in sandboxed virtual machines or containers with snapshot/rollback capability, isolating potential exploitation from production systems. Restrict capture file sources to trusted internal network monitoring only, blocking analysis of externally sourced pcap files until upgrade completion. Organizations using Wireshark for malware analysis should prioritize immediate patching as adversaries may deliberately craft malicious captures as anti-analysis techniques.

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Same weakness CWE-122 – Heap-based Buffer Overflow

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Same technique RCE

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Vendor StatusVendor

SUSE

Severity: High
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-2026-5405 vulnerability details – vuln.today
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