8.7

CVE-2026-84445: gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers

Awaiting analysis
AliasesRHSA-2026:72275RHSA-2026:73915RHSA-2026:76743
Published 14-09-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-84445 is a high (CVSS 8.7) Improper Validation of Array Index vulnerability in grpc grpc-go. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 50.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.7 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.64%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 66 · Related 65
OPENSUSE-SU-2026:11686-1OPENSUSE-SU-2026:11695-1OPENSUSE-SU-2026:11697-1OPENSUSE-SU-2026:11699-1OPENSUSE-SU-2026:11700-1OPENSUSE-SU-2026:11713-1

Timeline

  1. 14-09-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

8 scores · 8 sources · 2 versions

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.64% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard200 products
  • aactl< 0.4.12-r76
  • agentbeat< 9.2.7-r29
  • agentbeat-fips< 9.2.7-r28
  • amass< 5.1.1-r17
  • amazon-cloudwatch-agent< 1.300073.0-r1

1 vendor · 200 products · Showing 200 of 4212

References

40 links
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