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CVE-2026-55973 is a stack-based buffer overflow in NLnet Labs Unbound versions 1.23.0 through 1.25.1 when DNS Error Reporting is enabled. Unbound improperly uses the EDNS Report-Channel option length from an upstream response as the agent-domain length. If the encoded domain is followed by attacker-controlled trailing bytes, processing of the synthetic DNS Error Report query name subsequently walks beyond an embedded root label in find_closest_of_type(). The first trailing byte is then interpreted as a label length by dname_query_hash(), overwriting the stack variable labuf.
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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.
15 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.