CVE-2026-33871

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33871", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-24T15:10:05.679Z", "datePublished": "2026-03-27T19:55:23.135Z", "dateUpdated": "2026-09-15T12:04:27.844Z"}, "containers": {"cna": {"title": "Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv"}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"version": "< 4.1.132.Final", "status": "affected"}, {"version": ">= 4.2.0.Alpha1, < 4.2.10.Final", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-27T19:55:23.135Z"}, "descriptions": [{"lang": "en", "value": "Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server's lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue."}], "source": {"advisory": "GHSA-w9fj-cfpg-grvv", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-31T18:51:31.168118Z", "id": "CVE-2026-33871", "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": "2026-03-31T18:54:19.771Z"}}, {"affected": [{"collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": ["cpe:/a:redhat:cryostat:4::el9"], "defaultStatus": "affected", "packageName": "cryostat/cryostat-reports-rhel9", "product": "Cryostat 4 on RHEL 9", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "4.2.0-9", "versionType": "rpm"}]}, {"collectionURL": 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{"bugzilla": {"description": "netty: Netty: Denial of Service via HTTP/2 CONTINUATION frame flood", "id": "2452456", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452456"}, "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-770", "details": ["Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server's lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue.", "A flaw was found in Netty. A remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of CONTINUATION frames. The server's lack of a limit on these frames, coupled with a bypass of size-based mitigations using zero-byte frames, allows an attacker to consume excessive CPU resources. 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"package_name": "netty-codec-http", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Under investigation", "package_name": "netty-codec-http2", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Under investigation", "package_name": "netty-codec-http", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Under investigation", "package_name": "netty-codec-http2", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Under investigation", "package_name": "netty-codec-http", "product_name": "streams for Apache Kafka 3"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Under investigation", "package_name": "netty-codec-http2", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-03-27T19:55:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33871\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33871\nhttps://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,4.1.132.Final)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.2.0.Alpha1,4.2.10.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"}], "analysis": {"en": {"generated_at": "2026-03-31T04:23:27.115267+00:00", "value": {"mitigation_remediation": ["Upgrade Netty to version 4.1.132.Final, 4.2.10.Final, or a later release that contains the fix.", "If an immediate upgrade is not possible, configure the server or a network device to rate\u2011limit the number of HTTP/2 CONTINUATION frames allowed from a single client or to reject oversized frames.", "Verify that no custom configuration re\u2011enables unrestricted CONTINUATION frame processing after the upgrade."], "summary": {"action": "Apply Patch", "impact": "Denial of Service (CPU exhaustion)"}, "threat_synthesis": {"affected_systems": "Netty versions prior to 4.1.132.Final and 4.2.10.Final are affected.", "description_and_impact": "A remote attacker can send a flood of HTTP/2 CONTINUATION frames that bypass existing size limits by using zero-byte frames, causing the Netty server to consume excessive CPU resources and become unresponsive. This is a resource exhaustion flaw identified as CWE-770.", "risk_and_exploitability": "The vulnerability has a CVSS score of 8.7, indicating high severity, but the EPSS score is below 1%, suggesting low likelihood of widespread exploitation. It is not listed in the CISA KEV catalog. The attack vector is remote, requiring only network access to an HTTP/2-enabled Netty server, and can be performed with minimal bandwidth."}}}}, "created": "2026-03-29T20:30:15.506579+00:00", "updated": "2026-03-31T20:00:44.570756+00:00", "vendors": ["netty", "netty$PRODUCT$netty"]}