What is CVE-2026-84303?

CVE-2026-84303 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion

Which CVE IDs does CVE-2026-84303 cover?

CVE-2026-84303 covers the following CVE IDs: CVE-2026-84303. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2026-84303?

CVE-2026-84303 affects 1 product, including: azl3 grpc 1.62.3-1 on Azure Linux 3.0.

CVE-2026-84303Medium

gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-84303 →

🎯 Affected products1

azl3 grpc 1.62.3-1 on Azure Linux 3.0

✅ Remediation

Security Update

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84303
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade