Gardener: Authorization Bypass via Group Subject Injection (CVE-2026-79767) | HOL Guard CVE

Medium · CVSS 5.5CVE-2026-79767GHSA-GFJV-GQF2-C888

Gardener: Authorization Bypass via Group Subject Injection

Answer in brief

CVE-2026-79767 records a Medium severity (CVSS 5.5) vulnerability in Gardener: Authorization Bypass via Group Subject Injection. The current sources do not mark it as known exploited. The current feed maps gardener/gardener (generic), gardener/gardener (go), gardener/gardener (go), github.com/gardener/gardener (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 4 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps gardener/gardener (generic), gardener/gardener (go), gardener/gardener (go), github.com/gardener/gardener (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
gardener/gardenergeneric	<1.142.6 \|\| >= 1.143.0, < 1.143.3 \|\| >= 1.144.0, < 1.144.2	1.142.6
gardener/gardenergo	>=1.143.0,<1.143.3	1.143.3
gardener/gardenergo	>=1.144.0,<1.144.2	1.144.2
github.com/gardener/gardenergo	<1.142.6	1.142.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for gardener/gardener, gardener/gardener, gardener/gardener.
Review the reported fix. Update gardener/gardener to 1.142.6; gardener/gardener to 1.143.3; gardener/gardener to 1.144.2; github.com/gardener/gardener to 1.142.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source description

Gardener implements the automated management and operation of Kubernetes clusters as a service. Prior to 1.142.6, 1.143.3, 1.144.2, and 1.145.0, the customverbauthorizer admission plugin's mustCheckProjectMembers manage-members check compares changes to User subjects but does not account for Group or ServiceAccount subjects in Project.spec.members. A project administrator who lacks manage-members permission can add arbitrary Group or ServiceAccount subjects, including the system:authenticated Group, and thereby grant broad project access. The resulting access can include Shoots, Secrets, and cloud provider credentials. This issue is fixed in versions 1.142.6, 1.143.3, 1.144.2, and 1.145.0.

Quoted source text, attributed separately from HOL analysis.