CVE-2026-47879: Spring Cloud Gateway SSRF and native file access with gRPC

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-09-10
Weakness: CWE-918

Description

Spring Cloud Gateway JsonToGrpcGatewayFilterFactory allows arbitrary Spring Resource locations for defining the proto descriptor. Spring Cloud Gateway 5.0.0 - 5.0.2 Spring Cloud Gateway 4.3.0 - 4.3.5 Spring Cloud Gateway 4.0.0 - 4.2.9 Spring Cloud Gateway 3.1.13 and earlier

Affected products

Spring Cloud Gateway: before 3.1.14; from 4.0.0 before 4.2.10; from 4.3.0 before 4.3.6; from 5.0.0 before 5.0.3 — fixed in 3.1.14, 4.2.10, 4.3.6, 5.0.3
Spring Cloud Gateway: from 5.0.0 through 5.0.2; from 4.3.0 through 4.3.5; from 4.0.0 through 4.2.9; through 3.1.13

How to fix

Upgrade to a fixed version: Spring Cloud Gateway 3.1.14, 4.2.10, 4.3.6, 5.0.3. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47879

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