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CVE-2026-5405 is a heap-based buffer overflow in Wireshark's Remote Desktop Protocol dissector, specifically tracked as an RDP ZGFX parsing flaw. The vulnerability affects Wireshark 4.6.0 through 4.6.4 and 4.4.0 through 4.4.14. When Wireshark processes a malformed RDP packet or a crafted packet capture containing malicious RDP traffic, the dissector can write beyond heap-allocated memory, causing a crash and creating a potential path to arbitrary code execution. The issue is tracked in Wireshark issue 21105 and was addressed in the 4.6.5 and 4.4.15 releases.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as part of the Wireshark 4.6.8 advisory/plugin CVE list, but not described individually in the content.
A vulnerability in Wireshark's RDP dissector that may allow code execution.
A Wireshark RDP dissector vulnerability that can cause a crash with possible code execution when dissecting RDP packets.
A vulnerability in Wireshark's RDP dissector that could cause a crash and possibly allow arbitrary code execution when processing malformed network packets or malformed packet trace files.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.