Medium severity · published Aug 12, 2026
CVE-2026-18171
Docker Sandboxes read-only runtime mount writable through its shared-export alias
5.7
CVSS
0.1%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DS
Docker Sandboxes · Docker
0.35.0 through 0.38.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18171
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18171
docs.docker.com
https://docs.docker.com/ai/sandboxes/
docs.docker.com
https://docs.docker.com/ai/sandboxes/architecture/
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