CVE-2016-4972 — murano
CRITICALCVE-2016-4972 is a critical-severity (CVSS 9.8) Improper Input Validation vulnerability in murano. A fix is available for murano — see the affected versions and patch details below.
OpenStack Murano Code Execution
EPSS Exploitation Probability
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.
How urgent is this, really
CVE-2016-4972 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
murano🐍murano-dashboard🐍murano-dashboard🐍python-muranoclient🐍python-muranoclientReal-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
OpenStack Murano before 1.0.3 (liberty) and 2.x before 2.0.1 (mitaka), Murano-dashboard before 1.0.3 (liberty) and 2.x before 2.0.1 (mitaka), and python-muranoclient before 0.7.3 (liberty) and 0.8.x before 0.8.5 (mitaka) improperly use loaders inherited from yaml.Loader when parsing MuranoPL and UI files, which allows remote attackers to create arbitrary Python objects and execute arbitrary code via crafted extended YAML tags in UI definitions in packages.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | murano | all versions | 1.0.3pip install --upgrade 'murano==1.0.3' |
| 🐍PyPI | murano-dashboard | all versions | 1.0.3pip install --upgrade 'murano-dashboard==1.0.3' |
| 🐍PyPI | murano-dashboard | ≥ 2.0.0&&< 2.0.1 | 2.0.1pip install --upgrade 'murano-dashboard==2.0.1' |
| 🐍PyPI | python-muranoclient | all versions | 0.7.3pip install --upgrade 'python-muranoclient==0.7.3' |
| 🐍PyPI | python-muranoclient | ≥ 0.8.0&&< 0.8.5 | 0.8.5pip install --upgrade 'python-muranoclient==0.8.5' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for murano, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update murano to 1.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-4972 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-2016-4972 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2016-4972. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2016-4972 in your dependencies?
O3 Security finds CVE-2016-4972 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.