CVE-2026-84445

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 49% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 14, 2026

Advisory Details (10)

Auto-updated Sep 14, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

Release 1.83.2

Patch available: grpc/grpc-go v1.83.2

https://github.com/grpc/grpc-go/releases/tag/v1.83.2
github_release Patch Available

Release 1.82.2

Patch available: grpc/grpc-go v1.82.2

https://github.com/grpc/grpc-go/releases/tag/v1.82.2
github_commit

commit 93e31b48545e (grpc/grpc-go)

Fix landed in grpc/grpc-go commit 93e31b48545e — awaiting tagged release

https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f
github_commit Patch Available

commit 8668b69c167d (grpc/grpc-go)

Patch available: grpc/grpc-go v1.83.2 (contains commit 8668b69c167d)

https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4
github_commit Patch Available

commit 3822494d8ea0 (grpc/grpc-go)

Patch available: grpc/grpc-go v1.82.2 (contains commit 3822494d8ea0)

https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7
github_pr Patch Available

cherry-pick #9365 to v1.82.x

Patch available: grpc/grpc-go v1.82.2 (PR #9367 merged 2026-08-25)

https://github.com/grpc/grpc-go/pull/9367
github_pr Patch Available

cherry-pick #9365 to v1.83.x

Patch available: grpc/grpc-go v1.83.2 (PR #9366 merged 2026-08-25)

https://github.com/grpc/grpc-go/pull/9366
github_pr

transport: reject requests missing :authority and host headers

Fix merged in grpc/grpc-go PR #9365 on 2026-08-25 — awaiting tagged release

https://github.com/grpc/grpc-go/pull/9365
generic

xds: server crashes with 'index out of range' when a request omits :authority · Issue #9354 · grpc/grpc-go · GitHub

https://github.com/grpc/grpc-go/issues/9354
github Patch Available

Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in gRPC-Go xDS servers · Advisory · grpc/grpc-go · GitHub

https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj

Vendor Advisories for CVE-2026-84445(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
google.golang.org/grpc—1.85.0-dev.0.20260825072537-93e31b48545e—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 15× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 07:46 UTCVendor advisory
  2. 2026-09-18 19:55 UTCEG score recompute
  3. 2026-09-18 19:55 UTCVendor advisory
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 08:05 UTCVendor advisory
  6. 2026-09-17 20:16 UTCEG score recompute
  7. 2026-09-17 20:16 UTCVendor advisory
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 18:15 UTCEG score recompute
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-14 17:28 UTCEG score recompute
  13. 2026-09-14 16:45 UTCEG score recompute
  14. 2026-09-14 16:20 UTCEG score recompute▲ 8.70
  15. 2026-09-14 16:19 UTCMITRE cvelistV5CVSS v3 → 8.7 · CVSS v4 → 8.7
  16. 2026-09-08 21:36 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-84445?
CVE-2026-84445 is a high vulnerability published on September 8, 2026. gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go…
When was CVE-2026-84445 disclosed?
CVE-2026-84445 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84445 actively exploited?
CVE-2026-84445 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.9% of all scored CVEs.
What is the CVSS score of CVE-2026-84445?
CVE-2026-84445 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-84445?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84445, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-84445

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