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CVE-2026-76883 is an off-by-one heap out-of-bounds write in Wireshark's Catapult DCT2000 wiretap reader. When parsing DCT2000 data with an odd character count, the parser allocates floor(data_chars/2) bytes but writes ceil(data_chars/2) bytes, causing a one-byte heap overflow. The issue affects Wireshark 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18.
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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 Catapult DCT2000 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 that can cause high-impact availability loss (CVSS v3 A:H). Exploitation is local, requires high attack complexity and user interaction, and does not affect confidentiality or integrity according to the supplied CVSS vector.
An unpatched vulnerability tracked as CVE-2026-76883, referenced in a Nessus plugin affecting Debian Linux systems with the Wireshark package present.
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.