# CVE-2011-4953: PYSEC-2026-793 - Cobbler vulnerable to code injection via unsafe YAML loading

Source: https://junglewise.ai/threats/cve-2011-4953-cobbler-vulnerable-to-code-injection-via-unsafe-yaml-loading  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-06  
License: CC BY 4.0 with a link back

CVE-2011-4953 · Severity: info · Published 2026-07-06

Cobbler vulnerable to code injection via unsafe YAML loading

Technologies: [cobbler (PyPI)](https://junglewise.ai/threats/technologies/cobbler). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2011-4953 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2011-4953 being exploited in the wild.

**How severe is CVE-2011-4953?** Informational severity, published 6 July 2026.

**Which products and versions are affected?** cobbler (PyPI) ECOSYSTEM:introduced=0,fixed=2.6.0.

**Is there a fix for CVE-2011-4953?** Yes. cobbler (PyPI): upgrade to 2.6.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2011-4953?** Check whether you run cobbler (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- cobbler (PyPI): upgrade to 2.6.0 or later

  ```sh
  pip install "cobbler>=2.6.0"
  ```


## Affected products

- cobbler (PyPI) ECOSYSTEM:introduced=0,fixed=2.6.0

## Identifiers

- CVE-2011-4953
- GHSA-hpj3-5p46-g87w
- PYSEC-2026-793

## Related threats

- [PYSEC-2026-794 - Cobbler is vulnerable to code injection](https://junglewise.ai/threats/cve-2010-2235-cobbler-is-vulnerable-to-code-injection)
- [PYSEC-2026-792 - Cobbler subject to Command Injection](https://junglewise.ai/threats/cve-2012-2395-cobbler-subject-to-command-injection)
- [PYSEC-2026-795 - Cobbler Web Interface Kickstart Template Remote Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2008-6954-cobbler-web-interface-kickstart-template-remote-privilege)
- [PYSEC-2026-797 - Cobbler Path Traversal vulnerability](https://junglewise.ai/threats/cve-2014-3225-cobbler-path-traversal-vulnerability)
- [PYSEC-2026-796 - Cobbler XSS Vulnerability](https://junglewise.ai/threats/cve-2018-1000225-cobbler-xss-vulnerability)