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CVE-2026-56416 is a heap-based buffer overflow in NLnet Labs Unbound through version 1.25.1. During DNSSEC validation, canonicalization of RDATA for RRSIG-covered PX, RP, MINFO, or SOA RRsets calculates the location of a second embedded domain name after the first name without verifying that the second name is present. Malformed RDATA terminating after the first domain name can cause the canonicalization routine to traverse stale scratch-buffer data and potentially continue beyond the heap allocation, particularly where msg-buffer-size is reduced from its default value.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.