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How the CVE works:
The CVE-2025-11626 vulnerability exists in the MONGO protocol dissector within Wireshark versions 4.4.0 to 4.4.9 and 4.2.0 to 4.2.13. When Wireshark analyzes network traffic containing MONGO packets, the dissector parses and displays the data. A flaw in the dissector’s code allows malformed MONGO packets to trigger an infinite loop during parsing. This occurs due to improper handling of specific packet structures or lengths, causing the dissector to enter a loop without an exit condition. As a result, Wireshark experiences high CPU usage, becomes unresponsive, and may crash. This denial of service prevents network traffic analysis and disrupts monitoring activities. The infinite loop is triggered during dissection of MONGO protocol fields, where incorrect calculations or missing bounds checks lead to endless iteration. Attackers can exploit this by sending crafted MONGO packets over the network, which when captured and processed by Wireshark, cause the application to freeze. The vulnerability affects both GUI and command-line versions like TShark. Since Wireshark is widely used for network analysis, this flaw risks security professionals and network administrators. The issue is specific to the MONGO dissector and not other dissectors. The infinite loop consumes system resources, leading to denial of service for Wireshark. Mitigation involves upgrading to patched versions or avoiding suspicious MONGO traffic. The vulnerability was reported and assigned CVE-2025-11626.
Platform: Wireshark
Version: 4.4.0-4.4.9, 4.2.0-4.2.13
Vulnerability: MONGO dissector infinite loop
Severity: Critical
Date: 10/10/2025
Prediction: patch available 2025-10-10
What Undercode Say:
Analytics
Check Wireshark version wireshark --version | head -1 List dissectors including MONGO tshark -G protocols | grep mongo Capture MONGO traffic tshark -i eth0 -Y mongo -w capture.pcap Verify affected version dpkg -l | grep wireshark Test with sample packet editcap -c 1 malicious.pcap test.pcap
how Exploit:
Craft malicious MONGO packet sent over network; when Wireshark dissects, infinite loop triggers, causing DoS.
Protection from this CVE
Upgrade Wireshark version, avoid parsing MONGO traffic, use network filters.
Impact:
Denial of service, high CPU usage, application crash.
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Sources:
Reported By: nvd.nist.gov
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