CVE-2026-5856 Contiki-NG DNS/mDNS Resolver Out-of-Bounds Read via Unchecked skip_name Traversal Before Transaction-ID Validation

Contiki-NG's DNS/mDNS resolver skipname in os/services/resolv/resolv.c walks DNS wire-format name labels with no packet-boundary check, and the caller in newdata invokes it in a loop iterating nquestions times from the attacker-controlled DNS header before validating the transaction ID. An attack...

avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response

A flaw was found in Avahi, a system that enables devices to discover services on a local network. A remote attacker can exploit this vulnerability by sending a specially crafted mDNS multicast Domain Name System response containing a recursive CNAME Canonical Name record. This triggers an...