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CVE-2026-15170 is a heap-based buffer overflow in Wireshark's Z39.50 MARC21 dissector, in the dissect_marc_record() routine. The dissector calculates the number of MARC directory entries using floor division by the 12-byte entry length, but its parsing loop can perform an additional iteration when an attacker-controlled directory length is not divisible by 12. This permits a write of one MARC directory entry beyond the allocated heap array. The invalid write comprises attacker-derived fields and can corrupt memory or crash Wireshark or tshark while dissecting malicious Z39.50 traffic or a crafted capture file. Wireshark 4.6.0 through 4.6.6 and 4.4.0 through 4.4.16 are affected.
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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 vulnerability referenced by the plugin; no individual technical details are provided.
A Wireshark vulnerability referenced by the plugin; no technical description is provided.
A denial-of-service vulnerability in Wireshark's Z39.50 protocol dissector that can cause a crash.
A Wireshark-related denial-of-service vulnerability that can crash the Z39.50 protocol dissector.
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.