CVE-2026-84445Network attack vectorHinoki check available

Server crash via missing authority header validation

Published Sep 14, 2026 · Updated Sep 14, 2026

Denial of service in gRPC-Go xDS servers before 1.82.2 and 1.83.0 through 1.83.1 allows remote attackers to crash the server process. The HTTP/2 transport accepts an RPC with neither :authority nor Host, and RouteAndProcess indexes the resulting empty authority slice. The request must complete transport setup; insecure or ordinary TLS permits unauthenticated access, while strict mTLS or ALTS requires valid credentials.

CVSS severityUnavailable
Unscored
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in gRPC-Go xDS servers before 1.82.2 and 1.83.0 through 1.83.1 allows remote attackers to crash the server process. The HTTP/2 transport accepts an RPC with neither :authority nor Host, and RouteAndProcess indexes the resulting empty authority slice. The request must complete transport setup; insecure or ordinary TLS permits unauthenticated access, while strict mTLS or ALTS requires valid credentials.

The record

CVE
CVE-2026-84445
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
gRPC
Product
gRPC-Go
Classifications
CWE-129, CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.82.2
  2. Affected versionversion=>= 1.83.0, < 1.83.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

gRPC · gRPC-Goversion=< 1.82.2; version=>= 1.83.0, < 1.83.2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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