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Medium, CVSS 4.2

Spring gRPC SecurityContext leaks across requests upon authorization failure

CVE-2026-40968GHSA-4g9c-3x4p-mfpp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.springframework.grpc:spring-grpc 1.0.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS
  • CVE-2026-40968: 0.17% estimated exploitation activity in the next 30 days; percentile 6.56 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-4g9c-3x4p-mfpp

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-40968

Advisory: Spring gRPC SecurityContext leaks across requests upon authorization failure
IDs: CVE-2026-40968, GHSA-4g9c-3x4p-mfpp
Record: https://patchnext.com/advisories/cve-2026-40968 (revision 1, source checked 26 Oct 2026, 16:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.springframework.grpc:spring-grpc 1.0.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.springframework.grpc:spring-grpc: affected < 1.0.3; fixed in 1.0.3

## Suggested inspection (read-only)
- Maven org.springframework.grpc:spring-grpc: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.springframework.grpc:spring-grpc.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4g9c-3x4p-mfpp (GitHub-reviewed advisory GHSA-4g9c-3x4p-mfpp lists affected ranges: Maven org.springframework.grpc:spring-grpc >=0 <1.0.3)

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