GHSA-4g9c-3x4p-mfpp: org.springframework.grpc:spring-grpc (CVE-2026-40968)

Spring gRPC SecurityContext leaks across requests upon authorization failure

CVSS 4.3 MediumEPSS 0.0017 · 6th percentile

Published by the GitHub Advisory Database at 28 Apr 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.springframework.grpc:spring-grpc	Maven	<1.0.3	1.0.3

Identifiers

GHSA-4g9c-3x4p-mfpp · CVE-2026-40968

Weakness (CWE)

CWE-653

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Spring gRPC versions before 1.0.3 are vulnerable. When an authenticated user is denied access to a gRPC method, their identity can remain bound to the worker thread and be inherited by a later unauthenticated request on that same thread, possibly granting it elevated permissions. Upgrade to spring-grpc 1.0.3 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.3	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N	CNA (vmware)

CISA KEV Not listed.
EPSS 0.0017, the 6th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:20 UTC First seen by agentprime
31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.