Improper Handling of Case Sensitivity Affecting google-guest-agent package, versions <20260903.01-150000.1.85.1


Severity

Recommended
0.0
critical
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.55% (44th percentile)

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  • Snyk IDSNYK-SLES154-GOOGLEGUESTAGENT-20044177
  • published22 Sept 2026
  • disclosed21 Sept 2026

Introduced: 21 Sep 2026

NewCVE-2026-84303  (opens in a new tab)
CWE-178  (opens in a new tab)
CWE-863  (opens in a new tab)

How to fix?

Upgrade SLES:15.4 google-guest-agent to version 20260903.01-150000.1.85.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream google-guest-agent package and not the google-guest-agent package as distributed by SLES. See How to fix? for SLES:15.4 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1