Docker Sandboxes read-only runtime mount writable through its shared-export alias (CVE-2026-18171) | HOL Guard CVE

Medium · CVSS 5.7CVE-2026-18171

Docker Sandboxes read-only runtime mount writable through its shared-export alias

Answer in brief

CVE-2026-18171 records a Medium severity (CVSS 5.7) vulnerability in Docker Sandboxes read-only runtime mount writable through its shared-export alias. The current sources do not mark it as known exploited. The current feed maps Docker/Docker Sandboxes (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 Aug 12, 2026Updated Aug 18, 2026Source checked Sep 26, 2026First seen by HOL Aug 12, 2026Material review Aug 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.7. 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 Docker/Docker Sandboxes (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Docker/Docker Sandboxesgeneric	0.35.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Docker/Docker Sandboxes.
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
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source description

Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.

Quoted source text, attributed separately from HOL analysis.