Spring Cloud Gateway <=5.0.2 JsonToGrpcGWFF arbitrary resource location
CVE-2026-47879 Published on August 27, 2026
Spring Cloud Gateway SSRF and native file access with gRPC
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
Vulnerability Analysis
CVE-2026-47879 can be exploited with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-47879 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-47879
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Affected Versions
Spring Cloud Gateway:- Version 5.0.0, <= 5.0.2 is affected.
- Version 4.3.0, <= 4.3.5 is affected.
- Version 4.0.0, <= 4.2.9 is affected.
- Before and including 3.1.13 is affected.