CVE-2026-18171 PUBLISHED

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

Assigner: Docker
Reserved: 28.07.2026 Published: 12.08.2026 Updated: 12.08.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.7

Product Status

Vendor Docker
Product Docker Sandboxes
Versions Default: unaffected
  • affected from 0.35.0 to 0.38.0 (incl.)

Credits

  • Robbe Van Roey of Aikido Security finder

References

Problem Types

  • CWE-863: Incorrect Authorization CWE

Impacts

  • CAPEC-554 Functionality Bypass