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CVE-2026-41637 is a low-severity denial-of-service and service degradation vulnerability in NLnet Labs Unbound affecting versions 1.22.0 through 1.25.1. When handling DNS-over-QUIC queries, Unbound does not properly account for client-terminated requests associated with already in-flight resolution queries. An attacker can send DoQ queries for names that require resolution and then immediately terminate those queries using QUIC stream or connection termination mechanisms. Because these terminated queries continue to inflate the internal count of waiting replies for the in-flight resolution, Unbound can incorrectly believe the waiting-reply limit has been reached. Once that limit is exhausted, new client requests for the same already in-flight resolutions may be silently dropped, degrading resolver availability for legitimate users.
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What an attacker gets, and what they’ve been doing with it.
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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.
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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.