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CVE-2026-61670— microsandbox: Secret values exposed in world-readable process arguments

Quick assessment

Affected
superradcompany microsandbox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

microsandbox 是一个易用、快速且以本地优先的微虚拟机（microVM）运行时及库。在 0.5.10 之前， 会将 NetworkConfig 中的秘密值序列化后传入 参数，并通过 接受的重复 参数传递每个沙箱的密钥。其他本地用户或同宿主机上的其他进程可以通过宿主机的进程表读取这些值（包括 Linux 上的 进程命令行以及 Linux 和 macOS 上的进程列表），读取窗口贯穿沙箱的整个生命周期。利用该漏洞无需在沙箱内部执行代码，也无需访问启动用户的会话，却能在共享主机、CI 运行器和开发者系统上泄露宿

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-61670

Vulnerability Information
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Vulnerability Title
microsandbox: Secret values exposed in world-readable process arguments
Source: CVE Program / CVE List V5
Vulnerability Description
microsandbox is an easy, fast, local-first microVM runtime and library. Prior to 0.5.10, sdk/rust/lib/runtime/spawn.rs serializes NetworkConfig secret values into the --network-config argument and passes per-sandbox secrets through repeated --env arguments accepted by crates/cli/lib/sandbox_cmd.rs. Other local users or co-resident processes can read these values through the host process table, including /proc process command lines on Linux and process listings on Linux and macOS, for the lifetime of the sandbox. Exploitation does not require code execution inside the sandbox or access to the spawning user's session, and can disclose host-side API keys, tokens, and environment secrets on shared hosts, CI runners, and developer systems. This issue is fixed in version 0.5.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过处理环境导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
superradcompany microsandbox < 0.5.10 -

II. Public POCs for CVE-2026-61670

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III. Intelligence Information for CVE-2026-61670

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Other References for CVE-2026-61670 (2)

IV. Related Vulnerabilities

Same weakness: CWE-214

V. Comments for CVE-2026-61670

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