Detections
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Echo: google.golang.org/grpc: security update to 1.83.1

medium Tenable Self-Hosted Container Security Plugin ID 460051

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, the xDS RBAC HTTP filter in
 internal/xds/httpfilter/rbac/rbac.go does not lowercase header matcher names in normalizeHeaderMatcher
 even though incoming metadata keys are lowercase. A DENY policy using a mixed-case name such as X-Role or
 User-Agent therefore does not match and fails open, allowing requests that should be rejected. The same
 case mismatch permits :Scheme or Grpc-Status to evade gRFC A41 validation and prevents Host from being
 rewritten to :authority. This issue is fixed in version 1.83.1. (CVE-2026-84303)

Solution

Update the google.golang.org/grpc library and its related packages to version 1.83.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-84303

Plugin Details

Severity: Medium

ID: 460051

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.39

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-84303

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 9/1/2026

Reference Information

CVE: CVE-2026-84303