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CVE-2026-76886 is a heap-based buffer overflow in Wireshark's C12.22 dissector while processing large cleartext-authentication payloads through EAX/CMAC handling. Eax_Decrypt() accepts packet-derived 32-bit component lengths but passes them to CMAC routines using 16-bit length parameters. Truncation and subsequent integer wraparound can cause a small heap allocation followed by substantially larger memory-copy operations before MAC verification. The issue affects Wireshark 4.6.0 through 4.6.7 and the 4.4 branch before 4.4.18.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Wireshark C12.22 protocol-dissector vulnerability included in the Amazon Linux security update; the plugin reports exploits are available.
A Wireshark vulnerability addressed by Debian DSA-6471; the advisory states the set of flaws could cause denial of service or arbitrary-code execution.
A Unity Linux vulnerability with network attack vector, high attack complexity, no privileges or user interaction required, and high confidentiality, integrity, and availability impact according to the supplied CVSS v3 vector.
An unpatched vulnerability identified as CVE-2026-76886, referenced in a Nessus plugin and associated with Debian Linux systems and the wireshark package.
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.