CVE-2026-61670 microsandbox: Secret values exposed in world-readable process arguments
Local attackers can read secret API keys and tokens from process arguments in microsandbox, exposing sensitive data on shared hosts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61670?
CVE-2026-61670 is a medium-severity vulnerability in superradcompany microsandbox, published on 18 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-214
Which versions are affected by CVE-2026-61670?
2 open source packages ship an affected version, including microsandbox.
| Package | Affected | Fixed in |
|---|---|---|
microsandbox crates.io | All versions | 0.5.10 |
microsandbox crates.io | All versions | 0.5.10 |
How do I fix CVE-2026-61670?
Upgrade microsandbox to 0.5.10 or later.
Is CVE-2026-61670 being exploited?
There is no known exploitation of CVE-2026-61670 in the wild and no public exploit code.
Sources
Also known as GHSA-m8f5-rh7h-vgg3.