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CVE-2026-32665 is a remote denial-of-service vulnerability in NLnet Labs Unbound affecting versions 1.22.0 through 1.25.1 when downstream DNS-over-QUIC is enabled. In the downstream DoQ implementation, the first two bidirectional streams on a new QUIC connection, stream IDs 0 and 4, bypass the intended per-stream quic-size enforcement. Large input buffers are then allocated later, after receipt of only the 2-byte length prefix from those initial streams. This creates a memory-accounting bypass in which an attacker can declare large message sizes and cause allocations that exceed the configured quic-size limit with minimal traffic. The flaw is rooted in improper enforcement of resource limits for the initial QUIC streams, allowing oversized allocations before the configured budget gate is applied.
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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.
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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.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.