Docker is widely used across enterprises; this flaw lets sandboxed processes read or overwrite host files, enabling data theft or host compromise at scale.
CVE-2026-103916
Path-traversal in Docker 'sbx cp' allows sandboxes to read/write host files.
Is CVE-2026-103916 being exploited?
Not confirmed. CVE-2026-103916 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-103916?
CVE-2026-103916 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-103916?
Yes. A fix has been recorded for CVE-2026-103916. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-103916 affect?
CVE-2026-103916 affects Docker Sandboxes (sbx cp), sbx-releases (patched v0.51.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-103916?
Upgrade sbx to v0.51.0, audit sandbox activity, rotate exposed credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious sandbox can swap a workspace symlink to copy host files into the sandbox or write sandbox data to host paths with user permissions.
Immediate action required
- affected>= 0.28.0 and < 0.51.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- partial
Assessed by CISA 3 Nov 2026 (SSVC 2.0.3).
timeline
- 3 Nov 2026Published
- 3 Nov 2026CISA SSVC assessment: exploitation none · same day later
- 3 Nov 2026CVE record last updated · same day later
- 5 Nov 2026Analysed by vulneraibility.com · 2 days later
- Linkdocs.docker.com /ai/sandboxes/
- Linkdocs.docker.com /ai/sandboxes/security/isolation/
- Linkgithub.com /docker/sbx-releases/releases/tag/v0.51.0
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.