{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-44894", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-07T21:50:33.545Z", "datePublished": "2026-06-12T14:06:54.213Z", "dateUpdated": "2026-06-13T03:04:10.351Z"}, "containers": {"cna": {"title": "Netty's Default QUIC token handler accepts any client-supplied token", "problemTypes": [{"descriptions": [{"cweId": "CWE-940", "lang": "en", "description": "CWE-940: Improper Verification of Source of a Communication Channel", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j"}, {"name": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"version": ">= 4.2.0.Final, < 4.2.15.Final", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-12T14:06:54.213Z"}, "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. NoQuicTokenHandler is the tokenHandler used when the application does not set one. Prior to version 4.2.15.Final, its writeToken() returns false (server will not send Retry \u2014 acceptable), but validateToken() unconditionally `return 0`. In QuicheQuicServerCodec.handlePacket(), a non-negative return from validateToken() is interpreted as 'token is valid, ODCID starts at offset 0', causing the server to call quiche_accept as if the client's address had been validated by a Retry round-trip. Per RFC 9000 \u00a78.1, a validated address lifts the 3\u00d7 anti-amplification send limit. Thus any attacker who includes ANY non-empty token bytes in an Initial packet \u2014 with a spoofed victim source IP \u2014 causes the Netty server to treat the victim as validated and reflect full-size handshake flights (certificates, etc.) toward it without the 3\u00d7 cap. The correct 'no token handler' semantics would be to return -1 (invalid) so the normal un-validated path and amplification limit apply. Version 4.2.15.Final patches the issue."}], "source": {"advisory": "GHSA-cmm3-54f8-px4j", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-13T03:03:54.989814Z", "id": "CVE-2026-44894", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-13T03:04:10.351Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. NoQuicTokenHandler is the tokenHandler used when the application does not set one. Prior to version 4.2.15.Final, its writeToken() returns false (server will not send Retry \u2014 acceptable), but validateToken() unconditionally `return 0`. In QuicheQuicServerCodec.handlePacket(), a non-negative return from validateToken() is interpreted as 'token is valid, ODCID starts at offset 0', causing the server to call quiche_accept as if the client's address had been validated by a Retry round-trip. Per RFC 9000 \u00a78.1, a validated address lifts the 3\u00d7 anti-amplification send limit. Thus any attacker who includes ANY non-empty token bytes in an Initial packet \u2014 with a spoofed victim source IP \u2014 causes the Netty server to treat the victim as validated and reflect full-size handshake flights (certificates, etc.) toward it without the 3\u00d7 cap. The correct 'no token handler' semantics would be to return -1 (invalid) so the normal un-validated path and amplification limit apply. Version 4.2.15.Final patches the issue."}], "id": "CVE-2026-44894", "lastModified": "2026-06-12T15:55:06.377", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-06-12T15:16:26.240", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}, {"source": "security-advisories@github.com", "url": "https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-940"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "netty-codec-classes-quic: Netty: Denial of Service amplification via improper QUIC token validation", "id": "2488380", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488380"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-346", "details": ["A flaw was found in Netty, specifically within the netty-codec-classes-quic component's NoQuicTokenHandler. 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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-44894", "package_state": [{"cpe": "cpe:/a:redhat:apache_camel_hawtio:4", "fix_state": "Affected", "package_name": "netty-codec-classes-quic", "product_name": "Red Hat build of Apache Camel - HawtIO 4"}], "public_date": "2026-06-12T14:06:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-44894\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-44894\nhttps://github.com/netty/netty/releases/tag/netty-4.2.15.Final\nhttps://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.2.0.Final,4.2.15.Final)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "netty", "source": "cna", "vendor": "netty"}, "product": "netty", "vendor": "netty"}], "created": "2026-06-12T15:30:31.463347+00:00", "updated": "2026-06-13T13:30:09.751253+00:00", "vendors": ["netty", "netty$PRODUCT$netty"]}