Spring Security Advisories

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Spring Cloud Gateway SSRF and native file access with gRPC

HIGH | AUGUST 20, 2026 | CVE-2026-47879

Description

Spring Cloud Gateway JsonToGrpcGatewayFilterFactory allows arbitrary Spring Resource locations for defining the proto descriptor.

Affected Spring Products and Versions

Spring Cloud Gateway:

  • 5.0.0 - 5.0.2
  • 4.3.0 - 4.3.5
  • 4.0.0 - 4.2.9
  • 3.1.13 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
5.0.3OSS
4.3.6Enterprise Support Only
4.2.10Enterprise Support Only
3.1.14Enterprise Support Only

If using file based resources, set spring.cloud.gateway.server.webflux.json-to-grpc.valid-proto-descriptor-prefixes for 5.0.x/4.3.x or spring.cloud.gateway.json-to-grpc.valid-proto-descriptor-prefixes for 4.2.x/3.1.x. This property is a list of valid resources for reading proto descriptors.

Credit

The issue was reported responsibly by @thesecguy45.

References

History

  • 2026-08-20: Initial vulnerability report published.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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