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CVE-2026-18171

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

MEDIUM
5.7
CVSS Score
Published: August 12, 2026 at 02:47 PM UTC
Updated: October 23, 2026 at 08:10 PM UTC
2 products affected across 1 vendorDocker SandboxesDocker Sandboxes

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Severity
MEDIUM5.7
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Docker Sandboxes· Docker
95%
All versions
Docker Sandboxes· Docker
90%
0.35.0 ≤ v ≤ 0.38.00.35.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Product
Source: [email protected]
https://docs.docker.com/ai/sandboxes/
Product
Source: [email protected]
https://docs.docker.com/ai/sandboxes/architecture/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.7MEDIUMDocker
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-863

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