CVE-2026-47825: Spring Cloud Gateway Server Forwards Headers from Untrusted Proxies in certain situations

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-15 · updated 2026-10-25
Weakness: CWE-346

Description

Spring Cloud Gateway Server forwards the X-Forwarded-For and Forwarded headers from untrusted proxies in certain configuration scenarios. This affects both the WebMVC and WebFlux Gateway Servers. Affected versions: Spring Cloud Gateway 3.1.x (fix 3.1.13). Spring Cloud Gateway 4.1.x (fix 4.1.13). Spring Cloud Gateway 4.2.x (fix 4.2.9). Spring Cloud Gateway 4.3.x (fix 4.3.5). Spring Cloud Gateway 5.0.x (fix 5.0.2).

Affected products

Spring Cloud Gateway: through 3.1.10; from 4.0.0 before 4.1.13; from 4.2.0 before 4.2.9; from 4.3.0 before 4.3.4.1; from 5.0.0 before 5.0.1.1 — fixed in 4.1.13, 4.2.9, 4.3.4.1, 5.0.1.1
Spring Cloud Gateway: from 3.1.0 before 3.1.13; from 4.1.0 before 4.1.13; from 4.2.0 before 4.2.9; from 4.3.0 before 4.3.4.1; from 5.0.0 before 5.0.1.1 — fixed in 3.1.13, 4.1.13, 4.2.9, 4.3.4.1, 5.0.1.1

How to fix

Upgrade to a fixed version: Spring Cloud Gateway 4.1.13, 4.2.9, 4.3.4.1, 5.0.1.1; Spring Cloud Gateway 3.1.13, 4.1.13, 4.2.9, 4.3.4.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47825

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