CVE-2026-55851

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{"bugzilla": {"description": "io.netty/netty-codec-haproxy: Netty codec-haproxy: Denial of Service via crafted PROXY protocol v2 message", "id": "2505698", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2505698"}, "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": ["A flaw was found in Netty's codec-haproxy module. A remote attacker could exploit a vulnerability in the HAProxyMessageDecoder by sending a specially crafted PROXY protocol v2 message. This leads to unbounded buffer accumulation, causing a denial of service (DoS) due to memory exhaustion."], "name": "CVE-2026-55851", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-ekb-dispatcher-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-ekb-receiver-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "impact": "important", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": 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"cpe:/a:redhat:apache_camel_hawtio:4", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Red Hat build of Apache Camel - HawtIO 4"}, {"cpe": "cpe:/a:redhat:apicurio_registry:3", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Red Hat build of Apicurio Registry 3"}, {"cpe": "cpe:/a:redhat:debezium:3", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Red Hat build of Debezium 3"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "impact": "important", "package_name": "rhbk-keycloak-rhel9-operator/rhbk-keycloak-rhel9-operator", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", 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"package_name": "devspaces/multicluster-redirector-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "impact": "important", "package_name": "candlepin", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Affected", "impact": "important", "package_name": "netty-codec-haproxy", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-07-21T21:22:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55851\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55851\nhttps://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b\nhttps://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6\nhttps://github.com/netty/netty/releases/tag/netty-4.1.136.Final\nhttps://github.com/netty/netty/releases/tag/netty-4.2.16.Final\nhttps://github.com/netty/netty/security/advisories/GHSA-q6cq-mhr2-jmr5"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": ">= 4.2.0.Final, < 4.2.16.Final"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": ">= 4.1.0.Final, < 4.1.136.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": "2026-07-23T05:15:13.388679+00:00", "updated": "2026-08-04T05:30:04.725947+00:00", "vendors": ["netty", "netty$PRODUCT$netty"]}