CVE-2026-44894

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The correct 'no token handler' semantics would be to return -1 (invalid) so the normal un-validated path and amplification limit apply. 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A remote attacker can exploit this vulnerability by sending an Initial packet with any non-empty token bytes and a spoofed victim's IP address. This improper token validation causes the Netty server to bypass the 3x anti-amplification send limit, treating the victim as validated. As a result, the server reflects full-size handshake flights towards the spoofed victim, leading to an amplification attack."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-346", "description": "Origin Validation Error"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:53:03.417Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-44894", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-13T03:03:54.989814Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-13T03:04:04.265Z"}}], "cna": {"title": "Netty's Default QUIC token handler accepts any client-supplied token", "source": {"advisory": "GHSA-cmm3-54f8-px4j", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"status": "affected", "version": ">= 4.2.0.Final, < 4.2.15.Final"}]}], "references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j", "name": "https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "name": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. 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