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TI-2026-29619 Aliases CVE-2026-40968GHSA-4g9c-3x4p-mfpp

Spring gRPC SecurityContext leaks across requests on authorization failure

Priority LOW 37CWE-653Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00171 6th percentileScored 2026-11-07
Fix Fixed Spring gRPC (Spring): 1.0.3org.springframework.grpc:spring-grpc (Maven): 1.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
VMwareSpring gRPC1.0.0 to before 1.0.31.0.3Patch availableCNA
—org.springframework.grpc:spring-grpc (Maven)before 1.0.31.0.3Patch availableGHSA-4g9c-3x4p-mfpp
  • Spring gRPC VendorVMware Affected 1.0.0 to before 1.0.3 Fixed in 1.0.3 Patch available CNA
  • org.springframework.grpc:spring-grpc (Maven) Vendor— Affected before 1.0.3 Fixed in 1.0.3 Patch available GHSA-4g9c-3x4p-mfpp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vmware:spring_grpc:*:*:*:*:*:*:*:*before 1.0.3VulnerableVMware
  • cpe:2.3:a:vmware:spring_grpc:*:*:*:*:*:*:*:* Versions before 1.0.3 Vulnerable ·VMware

Remediation

  • Fix · CNA Spring gRPC (Spring) Fixed in 1.0.3
  • Fix · GHSA-4g9c-3x4p-mfpp org.springframework.grpc:spring-grpc (Maven) Fixed in 1.0.3 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Spring gRPC 1.0.3

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-29620 Spring gRPC AuthenticationException message reflected to remote clientPriority LOW 23
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40968
  2. 2026-10-03 Alias added: GHSA-4g9c-3x4p-mfpp

References

Advisory 2

Other 1

  • TI-2026-29620 Spring gRPC AuthenticationException message reflected to remote client CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences