CVE-2026-48706

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From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy's TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., >16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB\u2014for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true\u2014the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3."}, {"lang": "es", "value": "Envoy es un proxy de borde y de servicio de c\u00f3digo abierto dise\u00f1ado para aplicaciones nativas de la nube. Desde 1.34.0 hasta 1.35.13, 1.36.9, 1.37.5 y 1.38.3, existe una vulnerabilidad en el sumidero TCP StatsD de Envoy (TcpStatsdSink), donde el b\u00fafer de vaciado local del hilo puede ser desbordado por nombres de estad\u00edsticas excepcionalmente largos (p. ej., >16KiB). Durante el formateo, TcpStatsdSink reserva una \u00fanica porci\u00f3n de memoria contigua de 16KiB (FLUSH_SLICE_SIZE_BYTES). Si formatear una \u00fanica m\u00e9trica excede la capacidad restante, el vaciador inicia una rotaci\u00f3n del b\u00fafer pero incorrectamente contin\u00faa asignando otra porci\u00f3n fija de 16KiB. Si un atacante puede desencadenar un nombre de estad\u00edstica m\u00e1s largo que 16KiB -por ejemplo, enviando una solicitud HTTP o gRPC con una ruta de solicitud extremadamente larga (:path) que es registrada por el filtro grpc_stats configurado con stats_for_all_methods: true- el vaciador intentar\u00e1 copiar el nombre de la m\u00e9trica utilizando operaciones memcpy m\u00e1s all\u00e1 de los l\u00edmites del b\u00fafer de pila asignado. Esto conduce a un desbordamiento de escritura en la pila, lo que puede causar una denegaci\u00f3n de servicio inmediata (ca\u00edda del proceso) o una potencial ejecuci\u00f3n remota de c\u00f3digo (RCE). Esta vulnerabilidad est\u00e1 corregida en 1.35.13, 1.36.9, 1.37.5 y 1.38.3."}], "id": "CVE-2026-48706", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-48706", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-26T19:05:13.902352Z", "version": "2.0.3"}}]}, "published": "2026-06-26T18:17:00.027", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory", "Mitigation"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-7q3f-gwg7-j8g4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "envoy: Envoy Heap Buffer Overflow in TcpStatsdSink", "id": "2493676", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493676"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, a vulnerability exists in Envoy's TCP StatsD sink (TcpStatsdSink), where the thread-local flusher buffer can be overflowed by exceptionally long statistic names (e.g., >16KiB). During formatting, TcpStatsdSink reserves a single contiguous memory slice of 16KiB (FLUSH_SLICE_SIZE_BYTES). If formatting a single metric exceeds the remaining capacity, the flusher initiates a buffer rotation but incorrectly continues to allocate another fixed 16KiB slice. If an attacker can trigger a statistic name longer than 16KiB\u2014for example, by sending an HTTP or gRPC request with an extremely long request path (:path) that is recorded by the grpc_stats filter configured with stats_for_all_methods: true\u2014the flusher will attempt to copy the metric name using memcpy operations beyond the allocated heap buffer boundaries. This leads to a heap write overflow, which can cause immediate denial-of-service (process crash) or potential remote code execution (RCE). This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.", "A flaw was found in Envoy, an open-source edge and service proxy. An attacker can exploit a heap write overflow vulnerability in Envoy's TCP StatsD sink by sending exceptionally long statistic names, such as those found in HTTP or gRPC request paths. This can lead to a denial-of-service, causing the process to crash, and potentially enable remote code execution."], "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-2026-48706", "package_state": [{"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Affected", "package_name": "openshift-service-mesh/proxyv2-rhel9", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-proxyv2-rhel9", "product_name": "OpenShift Service Mesh 3"}], "public_date": "2026-06-26T17:38:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-48706\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-48706\nhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-7q3f-gwg7-j8g4"], "statement": "A Moderate-severity heap write overflow in Envoy's TCP StatsD sink can cause a denial of service in Red Hat OpenShift Service Mesh. Exploitation requires an attacker to send exceptionally long statistic names, typically via HTTP or gRPC request paths, making the attack complex and limiting its immediate impact to service availability.", "threat_severity": "Moderate"}

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