Executive Summary
On May 3, 2026, Wireshark released version 4.6.5, addressing 43 vulnerabilities, including 38 CVEs. This significant update was driven by a surge in AI-assisted vulnerability reports, highlighting the evolving landscape of cybersecurity threats. The vulnerabilities, if exploited, could allow attackers to execute arbitrary code or cause denial-of-service conditions, emphasizing the critical need for timely software updates.
The rapid identification and disclosure of these vulnerabilities underscore the dual role of AI in cybersecurity—both as a tool for defenders and a resource for attackers. Organizations must remain vigilant, ensuring that their security practices evolve alongside technological advancements to mitigate emerging threats effectively.
Why This Matters Now
The integration of AI in vulnerability discovery accelerates the identification of security flaws, necessitating prompt patching to prevent exploitation. Organizations must adapt to this accelerated threat landscape by enhancing their vulnerability management processes and ensuring timely software updates.
Attack Path Analysis
An attacker crafts a malicious packet or capture file targeting a specific protocol dissector vulnerability in Wireshark, leading to a crash or potential code execution. Upon successful exploitation, the attacker gains the ability to execute arbitrary code within the context of the Wireshark application. The attacker then leverages this access to move laterally within the network, targeting other systems or data. To maintain control, the attacker establishes a command and control channel, possibly using covert methods to evade detection. Sensitive data is exfiltrated from the compromised systems to external destinations. Finally, the attacker may deploy ransomware or other destructive payloads to disrupt operations or demand ransom.
Kill Chain Progression
Initial Compromise
Description
An attacker crafts a malicious packet or capture file targeting a specific protocol dissector vulnerability in Wireshark, leading to a crash or potential code execution.
Related CVEs
CVE-2026-5409
CVSS 5.5A vulnerability in the Monero dissector of Wireshark 4.6.4 and earlier allows remote attackers to cause a denial of service (application crash) via crafted Monero packets.
Affected Products:
Wireshark Foundation Wireshark – <= 4.6.4
Exploit Status:
no public exploitCVE-2026-5408
CVSS 5.5A vulnerability in the BT-DHT dissector of Wireshark 4.6.4 and earlier allows remote attackers to cause a denial of service (application crash) via crafted BT-DHT packets.
Affected Products:
Wireshark Foundation Wireshark – <= 4.6.4
Exploit Status:
no public exploitCVE-2026-5406
CVSS 5.5A vulnerability in the FC-SWILS dissector of Wireshark 4.6.4 and earlier allows remote attackers to cause a denial of service (application crash) via crafted FC-SWILS packets.
Affected Products:
Wireshark Foundation Wireshark – <= 4.6.4
Exploit Status:
no public exploitCVE-2026-5407
CVSS 5.5A vulnerability in the SMB2 dissector of Wireshark 4.6.4 and earlier allows remote attackers to cause a denial of service (infinite loop) via crafted SMB2 packets.
Affected Products:
Wireshark Foundation Wireshark – <= 4.6.4
Exploit Status:
no public exploitCVE-2026-5402
CVSS 8.8A vulnerability in the TLS dissector of Wireshark 4.6.4 and earlier allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted TLS packets.
Affected Products:
Wireshark Foundation Wireshark – <= 4.6.4
Exploit Status:
no public exploit
MITRE ATT&CK® Techniques
Exploitation for Client Execution
Exploit Public-Facing Application
Exploitation for Defense Evasion
Endpoint Denial of Service
Hardware Additions
Valid Accounts
Command and Scripting Interpreter
Ingress Tool Transfer
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
PCI DSS 4.0 – Ensure all system components are protected from known vulnerabilities
Control ID: 6.2
NYDFS 23 NYCRR 500 – Cybersecurity Policy
Control ID: 500.03
DORA – ICT Risk Management Framework
Control ID: Article 5
CISA ZTMM 2.0 – Asset Management
Control ID: 2.1
NIS2 Directive – Cybersecurity Risk Management Measures
Control ID: Article 21
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Computer/Network Security
Wireshark vulnerability disclosure with 43 fixes impacts network security professionals using packet analysis tools for threat detection and incident response.
Information Technology/IT
AI-assisted vulnerability reports in Wireshark 4.6.5 affect IT departments relying on network monitoring tools for traffic analysis and security operations.
Financial Services
Network analysis tool vulnerabilities threaten financial institutions' compliance monitoring capabilities, potentially exposing encrypted traffic inspection and regulatory audit functions.
Health Care / Life Sciences
Healthcare organizations using Wireshark for network troubleshooting face HIPAA compliance risks from packet analysis vulnerabilities affecting protected health information monitoring.
Sources
- Wireshark 4.6.5 Released, (Sun, May 3rd)https://isc.sans.edu/diary/rss/32944Verified
- Wireshark 4.6.5 Release Noteshttps://www.wireshark.org/docs/relnotes/wireshark-4.6.5.htmlVerified
- Wireshark 4.6.5 Packet Analyzer Fixes Dozens of Vulnerabilitieshttps://linuxiac.com/wireshark-4-6-5-packet-analyzer-fixes-dozens-of-vulnerabilities/Verified
- Wireshark 4.6.5 Fixes Multiple Vulnerabilities and Updates Protocol Supporthttps://9to5linux.com/wireshark-4-6-5-fixes-multiple-vulnerabilities-and-updates-protocol-supportVerified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Aviatrix Zero Trust CNSF is pertinent to this incident as it embeds security directly into the cloud fabric, potentially limiting the attacker's ability to move laterally and exfiltrate data.
Control: Cloud Native Security Fabric (CNSF)
Mitigation: The attacker's ability to exploit the Wireshark vulnerability may be constrained by CNSF's embedded security measures, potentially reducing the likelihood of successful initial compromise.
Control: Zero Trust Segmentation
Mitigation: The attacker's ability to escalate privileges may be constrained by Zero Trust Segmentation, potentially limiting access to sensitive resources.
Control: East-West Traffic Security
Mitigation: The attacker's lateral movement may be constrained by East-West Traffic Security, potentially reducing the ability to access other systems.
Control: Multicloud Visibility & Control
Mitigation: The attacker's ability to establish command and control channels may be constrained by Multicloud Visibility & Control, potentially reducing covert communication.
Control: Egress Security & Policy Enforcement
Mitigation: The attacker's data exfiltration efforts may be constrained by Egress Security & Policy Enforcement, potentially reducing unauthorized data transfers.
The attacker's ability to deploy destructive payloads may be constrained by the cumulative effect of CNSF controls, potentially reducing operational disruption.
Impact at a Glance
Affected Business Functions
- Network Monitoring
- Security Analysis
Estimated downtime: N/A
Estimated loss: N/A
n/a
Recommended Actions
Key Takeaways & Next Steps
- • Implement inline intrusion prevention systems (IPS) to detect and block malicious payloads targeting known vulnerabilities.
- • Enforce zero trust segmentation to limit lateral movement within the network.
- • Deploy egress security and policy enforcement to monitor and control outbound traffic, preventing unauthorized data exfiltration.
- • Utilize threat detection and anomaly response systems to identify and respond to suspicious activities promptly.
- • Regularly update and patch software to mitigate known vulnerabilities and reduce the attack surface.
