How severe is CVE-2011-4953?

No CVSS score has been assigned to CVE-2011-4953 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2011-4953?

CVE-2011-4953 affects the following packages: cobbler (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2011-4953?

Update cobbler to 2.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2011-4953 is resolved across your whole dependency graph.

How do I detect CVE-2011-4953 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cobbler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2011-4953 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2011-4953?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2011-4953 can be triaged on real exposure rather than presence alone.

Is CVE-2011-4953 actively exploited in the wild?

No public exploit code has been indexed for CVE-2011-4953 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2011-4953?

CVE-2011-4953 has an EPSS (Exploit Prediction Scoring System) score of 2.2%, placing it in the 82th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2011-4953?

CVE-2011-4953 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2011-4953 published, and has it been updated?

CVE-2011-4953 was published on May 17, 2022 and was last updated on July 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2011-4953 — cobbler

Fix: cobbler/cobbler@1b4f9ec

CVE-2011-4953 is a Improper Input Validation vulnerability in cobbler. A fix is available for cobbler — see the affected versions and patch details below.

Cobbler vulnerable to code injection via unsafe YAML loading

Also known asPYSEC-2026-793

Published

May 17, 2022

Updated

Jul 7, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 18, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

🐍cobbler

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

The set_mgmt_parameters function in item.py in cobbler before 2.2.2 allows context-dependent attackers to execute arbitrary code via vectors related to the use of the yaml.load function instead of the yaml.safe_load function, as demonstrated using Puppet.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`cobbler`	all versions	2.6.0`pip install --upgrade 'cobbler==2.6.0'`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cobbler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update cobbler to 2.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2011-4953 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2011-4953 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2011-4953. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The `set_mgmt_parameters` function in item.py in cobbler before 2.2.2 allows context-dependent attackers to execute arbitrary code via vectors related to the use of the `yaml.load` function instead of the `yaml.safe_load function`, as demonstrated using Puppet.

O3 Security · Impact-Aware SCA

Is CVE-2011-4953 in your dependencies?

O3 Security finds CVE-2011-4953 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works