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CVE-2026-120307— Beta9 容器逃逸漏洞(未验证沙盒路径)

一分钟漏洞结论

影响对象
beam-cloud Beta9 worker
利用判断
尚无明确在野利用证据,仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本;无法立即升级时,限制受影响服务暴露并加强监测。

Beta9 工作节点(worker)在容器外部提供沙箱文件 API 服务。 函数将租户的容器路径转换为工作节点路径。如果未解析的路径以某个挂载目标开头(包括默认上传挂载点 ),则会将剩余部分通过 拼接到该挂载点的源路径上;而 会在前缀检查之后清理父目录层级段(即 )。若连续出现足够多的此类段,即可构造出指向工作节点上任意绝对路径的路径。对于不匹配任何挂载点的路径,系统会将其拼接到容器根目录,并在工作节点自身的文件系统中打开,因此像 这样指向 的绝对符号链接会被解析到工作节点的根目录下。 上传、下载、获取文件状态、列

CVSS 9.9 · Critical

影响版本矩阵 1

厂商产品 版本范围状态
beam-cloud Beta9 worker < 0.1.756 affected
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一、 漏洞 CVE-2026-120307 基础信息

漏洞信息

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Vulnerability Title
Beta9 container escape via unvalidated sandbox file paths
来源: CVE Program / CVE List V5
Vulnerability Description
The Beta9 worker serves the sandbox file API from outside the container. getHostPathFromContainerPath turns the tenant's container path into a worker path. If the unresolved path starts with a mount destination, including the default upload mount at /tmp/.beta9, the remainder is joined onto that mount's source with filepath.Join, which cleans parent-directory segments after the prefix check. A long enough run of those segments names any absolute path on the worker. A path that matches no mount is joined onto the container root and opened in the worker's own filesystem, so an absolute symbolic link such as /var/run pointing at /run is followed against the worker root. Upload, download, stat, list, find-in-files, replace-in-files, and delete-file all call this helper. A tenant with a workspace token and one running sandbox can read, write, list, and delete files on the hosting worker as root, including files of other tenants on that machine. A read-only proof downloaded the worker pod's Kubernetes service account token through the file API for a path that did not exist inside the sandbox. In the shipped remote-node manifests that service account is bound to cluster-admin. Fixed in worker 0.1.756: sandbox file operations and workspace sync open paths with os.OpenRoot, so parent-directory and symlink lookups stay inside the container root or the mount source.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
beam-cloud Beta9 worker 0 ~ 0.1.756 -

二、漏洞 CVE-2026-120307 的公开POC

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三、漏洞 CVE-2026-120307 的情报信息

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CVE-2026-120307 其他参考 (4)

同批安全公告 · beam-cloud · 2026-11-01 · 共 3 条

CVE-2026-120308 9.9 CRITICAL Beta9 卷路径遍历导致主机文件系统暴露漏洞
CVE-2026-120306 9.9 CRITICAL Beta9 构建沙箱通过 chroot 隔离逃逸漏洞

IV. Related Vulnerabilities