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CVE-2026-76885 is a heap out-of-bounds read in Wireshark's Tektronix K12 capture-file parser. While reading a record, the parser accounts for skipped 16-byte blobs in its returned length even though those bytes are not copied to the record buffer. The inflated length is propagated by the K12 read paths to packet-data processing, which trusts it and performs a buffer append that reads beyond the allocated heap buffer. The issue affects Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18; it was also reproduced in a 4.7.2 development build.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service crash in the Wireshark Tektronix K12xx 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 tracked as CVE-2026-76885. It has a CVSS v3 network attack vector, high attack complexity, requires user interaction, and affects availability only at low impact according to the supplied CVSS vector.
An unpatched vulnerability tracked as CVE-2026-76885, 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.