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CVE-2026-76926 is a denial-of-service vulnerability in the Wireshark BUSMASTER capture-file parser affecting Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18. A newline encountered while parsing an unfinished BUSMASTER header or time statement reaches a Flex fatal-error path. Rather than reporting a malformed capture file to the caller, the generated scanner terminates the process with exit status 2. The issue affects Wireshark, TShark, and applications that embed libwiretap when they process attacker-controlled input, including during automatic file-format detection.
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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.
If you can’t patch tonight, do this now.
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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service abnormal exit in the Wireshark BUSMASTER file parser.
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 low availability impact. The provided CVSS v3 vector indicates network attackability, high attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality or integrity impact, and low availability impact.
A specific vulnerability tracked as CVE-2026-76926 affecting Debian Linux systems in relation to the Wireshark package; the content indicates it is unpatched and has availability impact.
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.