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Medium · 4.3 CVE-2026-40968 EUVD-2026-26054GHSA-4g9c-3x4p-mfpp

Spring gRPC SecurityContext leaks across requests on authorization failure

Published Apr 28, 2026 · Updated Apr 28, 2026 · Assigned by vmware

Description

When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions.

Affected versions:
Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

Affected products

VendorProductAffectedFixed
Spring Spring gRPC 1.0.0 – < 1.0.3 1.0.3

Affected packages

EcosystemPackageAffectedFixedRecord
Maven org.springframework.grpc:spring-grpc < 1.0.3 1.0.3 GHSA-4g9c-3x4p-mfpp

References