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CVE-2026-12039— Docker Sandboxes network egress allowlist bypass via unfiltered DNS resolution

AI Predicted 5.3 Difficulty: Easy EPSS 0.15% · P5

Affected Version Matrix 1

VendorProductVersion RangeStatus
DockerDocker Sandboxes0.13.0< 0.33.0affected
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I. Basic Information for CVE-2026-12039

Vulnerability Information
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Vulnerability Title
Docker Sandboxes network egress allowlist bypass via unfiltered DNS resolution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
Docker Sandboxes 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docker Docker Sandboxes是美国Docker公司的一个容器沙箱隔离环境。 Docker Sandboxes 0.13.0版本至0.33.0之前版本存在授权问题漏洞，该漏洞源于授权问题，导致HTTP/S出口允许列表未应用于DNS解析，内嵌DNS服务器在无需检查策略的情况下将域名转发给主机解析器，使沙箱内的工作负载能够通过DNS隐蔽通道绕过配置的允许列表泄露数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
DockerDocker Sandboxes 0.13.0 ~ 0.33.0 cpe:2.3:a:docker:sandboxes:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12039

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III. Intelligence Information for CVE-2026-12039

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Vendor Pages for CVE-2026-12039 (2)

IV. Related Vulnerabilities

Same product: Docker Sandboxes
Same vendor: Docker
Same weakness: CWE-923

V. Comments for CVE-2026-12039

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