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CVE-2026-44894 is an improper source-verification flaw in Netty QUIC servers using the default NoQuicTokenHandler in io.netty:netty-codec-classes-quic versions 4.2.0.Final through 4.2.14.Final. The handler's validateToken() method returned 0 for arbitrary tokens, while the QUIC server codec interpreted every non-negative return value as successful token validation and an original destination connection ID offset. Consequently, any non-empty token in a QUIC Initial packet caused the server to consider the claimed client address validated. This incorrectly bypassed the RFC 9000 address-validation anti-amplification restriction that otherwise limits server transmission to three times the bytes received from an unvalidated address.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Netty QUIC server vulnerability in the default NoQuicTokenHandler that incorrectly validates tokens, bypassing RFC 9000 anti-amplification protections and enabling reflection/amplification DDoS attacks.
A Netty QUIC token validation flaw that allows bypass of the anti-amplification limit and reflection of handshake traffic to a spoofed victim.
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.