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CVE-2026-33186: gRPC-Go has an authorization bypass via missing leading slash in :path

highCVSS 8.1CVE-2026-33186

CSIRTS triage

vendor: gRPCproduct: gRPC-GoAuthentication bypass
What
gRPC-Go fails to validate the leading slash in the :path pseudo-header, allowing authorization bypass.
Who is affected
Deployments using gRPC-Go are affected.
Urgency
High severity (CVSS 8.1) and not yet exploited in the wild, but authorization bypass poses significant risk.
Action
Upgrade gRPC-Go to a patched version that properly validates :path pseudo-header formatting.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.1
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33186

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-33186coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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