Admission Control Bypass via Hardcoded Sidecar Image Exemption (CVE-2026-78427) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-78427

Admission Control Bypass via Hardcoded Sidecar Image Exemption

Answer in brief

CVE-2026-78427 records a Unknown severity vulnerability in Admission Control Bypass via Hardcoded Sidecar Image Exemption. The current sources do not mark it as known exploited. The current feed maps go/github.com/neuvector/neuvector (generic). 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 go/github.com/neuvector/neuvector (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
go/github.com/neuvector/neuvectorgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for go/github.com/neuvector/neuvector.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

The NeuVector admission webhook silently excludes containers from policy evaluation when their image path matches one of three hardcoded service mesh sidecar images. Since the image path is entirely controlled by the workload author, any user capable of deploying workloads can evade admission deny rules simply by naming their image path after one of these sidecar images.

Quoted source text, attributed separately from HOL analysis.