Improper Handling of Highly Compressed Data (Data Amplification) Affecting io.vertx:vertx-grpc-server package, versions [4.0.0, 4.5.35)[5.0.0, 5.1.10)[5.2.0, 5.2.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IOVERTX-21715423
- published26 Oct 2026
- disclosed15 Oct 2026
- creditMichael-JRead
Introduced: 15 Oct 2026
NewCVE-2026-102477 (opens in a new tab)How to fix?
Upgrade io.vertx:vertx-grpc-server to version 4.5.35, 5.1.10, 5.2.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) via the gzip-decoding path in GrpcReadStreamBase used by GrpcServerRequestImpl. An attacker can send a small gzip-compressed gRPC request that expands beyond the configured per-message maximum; because the limit applies to the received compressed bytes, the server allocates excessive memory while decompressing the request, disrupting service.