PT-2026-50674 · Docker · Docker Sandboxes

Sophie Lemos · Publicado 2026-06-18 · Atualizado 2026-06-18 · CVE-2026-12039

Mitre

CVSS v4.0

5.7

Média

Vetor base

AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Docker Sandboxes (sbx) enforces an HTTP/S-only egress allowlist but does not apply it to DNS resolution: the per-network embedded DNS server forwards any queried name to the host resolver whenever the network is internet-connected, without consulting the policy. A workload inside a sandbox, which the threat model treats as untrusted, can therefore encode data into DNS labels for an attacker-controlled domain and exfiltrate it through a DNS covert channel, bypassing the configured allowlist.

Correção

Enumeração de Fraquezas

CWE-923

Identificadores relacionados

CVE-2026-12039

Produtos afetados

Docker Sandboxes

Referências · 3

• https://github.com/docker/sbx-releases/releases/tag/v0.33.0 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-12039 · Nota de Segurança
• https://docs.docker.com/ai/sandboxes · Nota