CVE-2026-102477

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{"bugzilla": {"description": "io.vertx/vertx-grpc-server: vertx-grpc-server: Denial of Service via compression bomb", "id": "2553096", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2553096"}, "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-409", "details": ["In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], a gRPC endpoint does have a configurable per message maximum size in bytes, however the maximum size applies to the received bytes. When applied to a compressed message, this only applies to the compressed size and not the actual size of the uncompressed content. This can be used to force a gRPC endpoint to allocate more bytes than the value defined by the configuration, making the endpoint vulnerable to compression bomb attacks.\nThe impacted component is io.vertx:vertx-gprc-server.", "A flaw was found in Eclipse Vert.x vertx-grpc-server. The server's configured maximum message size limit is enforced only on the received compressed data rather than on the uncompressed payload. A remote attacker can exploit this flaw by sending a specially crafted compressed message, causing excessive memory allocation upon decompression and resulting in a Denial of Service (DoS)."], "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-2026-102477", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Affected", "package_name": "exploit-intelligence/agent-client-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:camel_quarkus:3", "fix_state": "Affected", "package_name": "vertx-grpc-server", "product_name": "Red Hat build of Apache Camel 4 for Quarkus 3"}, {"cpe": "cpe:/a:redhat:apicurio_registry:3", "fix_state": "Affected", "package_name": "vertx-grpc-server", "product_name": "Red Hat build of Apicurio Registry 3"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "vertx-grpc-server", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:quarkus:3", "fix_state": "Affected", "package_name": "vertx-grpc-server", "product_name": "Red Hat build of Quarkus"}], "public_date": "2026-10-15T08:28:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-102477\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-102477\nhttps://github.com/eclipse-vertx/vertx-grpc/security/advisories/GHSA-4wvq-75mw-q6cg\nhttps://gitlab.eclipse.org/security/cve-assignment/-/work_items/349"], "statement": "This IMPORTANT-severity flaw affects the Eclipse Vert.x gRPC server component (io.vertx:vertx-grpc-server). The component's configurable per-message maximum size limit is enforced only on the received compressed bytes rather than on the uncompressed payload, so a remote, unauthenticated attacker can send a specially crafted compressed gRPC message (a compression bomb) that forces the endpoint to allocate more memory than the configured limit permits, causing excessive memory allocation and a denial of service of the affected gRPC service. Only availability is impacted; confidentiality and integrity are not affected. Red Hat rates this flaw as IMPORTANT with a CVSS:3.1 base score of 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), matching the CVSS:3.1 score published in the upstream Eclipse Vert.x advisory; the CVEORG CVSS:4.0 score of 8.7 is higher due to the different CVSS version methodology. This flaw is in an upstream Maven component, and no Red Hat products are currently listed as affected.", "threat_severity": "Important"}

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