CVE-2026-120308：A Beta9 tenant can attach a volume when deploying a function, endpoint

A Beta9 tenant can attach a volume when deploying a function, endpoint, or task queue. The gateway builds the host path by joining the shared volumes root, the workspace name, and the volume identifier from the stub configuration. Nothing checks that the identifier names a volume that workspace owns. Parent-directory segments in the identifier collapse the joined path to the worker's filesystem root, and the worker bind-mounts that path into the sandbox read-write unless the volume was explicitly marked read-only. A tenant with a workspace token can therefore read and write the worker's files, including other tenants' volumes stored on that machine. Confirmed against gateway 0.1.769 and worker 0.1.745. Fixed in gateway 0.1.776 and worker 0.1.756: volume identifiers and mount paths are validated before a mount is built, including for stubs saved before the check existed, and the gateway rejects a volume that does not exist or is not owned by the workspace.

漏洞详情

A Beta9 tenant can attach a volume when deploying a function, endpoint, or task queue. The gateway builds the host path by joining the shared volumes root, the workspace name, and the volume identifier from the stub configuration. Nothing checks that the identifier names a volume that workspace owns. Parent-directory segments in the identifier collapse the joined path to the worker's filesystem root, and the worker bind-mounts that path into the sandbox read-write unless the volume was explicitly marked read-only. A tenant with a workspace token can therefore read and write the worker's files, including other tenants' volumes stored on that machine. Confirmed against gateway 0.1.769 and worker 0.1.745. Fixed in gateway 0.1.776 and worker 0.1.756: volume identifiers and mount paths are validated before a mount is built, including for stubs saved before the check existed, and the gateway rejects a volume that does not exist or is not owned by the workspace.

风险评估

• CVSS 评分：9.9（CRITICAL）
• 评分版本：CVSS 3.1
• 攻击向量：CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

弱点类型

CWE-22、CWE-668

参考链接

• https://github.com/beam-cloud/beta9
• https://github.com/beam-cloud/beta9/commit/a28bf12cf0007c792a25d8ed282b4e8bf6f30393
• https://github.com/beam-cloud/beta9/pull/1897
• https://github.com/beam-cloud/beta9/releases/tag/gateway-0.1.769
• https://github.com/beam-cloud/beta9/releases/tag/gateway-0.1.776
• https://github.com/beam-cloud/beta9/releases/tag/worker-0.1.745

数据来源：NVD（美国国家漏洞数据库），入库时按 CVSS 评分筛选。

原文链接： CVE-2026-120308：A Beta9 tenant can attach a volume when deploying a function, endpoint