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CVE-2016-4972

OpenStack Murano Code Execution

9.8 CriticalFix available

CVE-2016-4972 is a critical vulnerability (CVSS 9.8) in Openstack Murano, published September 26, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.19%, the 88th percentile. Fixed in murano 1.0.3.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

3.19%Down 2.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2016-4972
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2016-4972
Updated
2026-11-02
EUVDEUVD-2016-0028 No score

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.

Record
EUVD-2016-0028
Updated
2026-11-03
GitHub AdvisoriesGHSA-87r7-q54j-f9qg 9.3

OpenStack Murano Code Execution

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.

Record
GHSA-87r7-q54j-f9qg
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2016-4972
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSVDEBIAN-CVE-2016-4972 9.8

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.

Record
DEBIAN-CVE-2016-4972
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 5 moreShow less
OSVGHSA-87r7-q54j-f9qg 9.3

OpenStack Murano Code Execution

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.

Record
GHSA-87r7-q54j-f9qg
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Updated
2026-11-02
OSVPYSEC-2026-429 9.3

OpenStack Murano Code Execution

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.

Record
PYSEC-2026-429
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2026-430 9.3

OpenStack Murano Code Execution

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.

Record
PYSEC-2026-430
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2016-4972 9.8

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.

Record
UBUNTU-CVE-2016-4972
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2016-22 No score

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.

Record
PYSEC-2016-22
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
murano
PyPI
 before 1.0.3
1.0.3
murano-dashboard
PyPI
 before 1.0.3
1.0.3
python-muranoclient
PyPI
 before 0.7.3
0.7.3
murano-dashboard
PyPI
 2.0.0 up to 2.0.1
2.0.1
python-muranoclient
PyPI
 0.8.0 up to 0.8.5
0.8.5
murano
Debian:12
 before 1:2.0.1-1
1:2.0.1-1
murano-dashboard
Debian:12
 before 1:2.0.0-5
1:2.0.0-5
python-muranoclient
Debian:12
 before 0.8.3-4
0.8.3-4
murano
PyPI
 before 1.0.3, plus listed versions
1.0.01.0.0.0b11.0.0.0b21.0.0.0b31.0.0.0rc11.0.11.0.2
1.0.3
murano-dashboard
PyPI
 before 1.0.3, plus listed versions
1.0.01.0.0.0b11.0.0.0b21.0.0.0b31.0.0.0rc11.0.11.0.2
1.0.3
Show 6 moreShow less
Affected packages
PackageAffectedFixed
python-muranoclient
PyPI
 before 0.7.3, plus listed versions
0.20.2.110.2.120.30.4
Show 17 moreShow less
0.4.10.5.00.5.10.5.20.5.30.5.40.5.50.5.60.5.70.5.80.5.90.6.00.6.20.6.30.7.00.7.10.7.2
0.7.3
python-muranoclient
PyPI
 0.8.0 up to 0.8.5, plus listed versions
0.8.10.8.20.8.30.8.4
0.8.5
python-muranoclient
PyPI
 before 0.7.3, 0.8 up to 0.8.5, plus listed versions
0.20.2.110.2.120.30.4
Show 22 moreShow less
0.4.10.5.00.5.10.5.20.5.30.5.40.5.50.5.60.5.70.5.80.5.90.6.00.6.20.6.30.7.00.7.10.7.20.8.00.8.10.8.20.8.30.8.4
0.7.30.8.5
murano
Ubuntu:16.04:LTS
 All versions, plus listed versions
1:1.0.0~rc1-1ubuntu11:1.0.1-21:2.0.0~b3-11:2.0.0~b3-21:2.0.0~rc1-11:2.0.0~rc3-11:2.0.0-1
 None known
murano-dashboard
Ubuntu:16.04:LTS
 All versions, plus listed versions
1:1.0.0~rc1-1ubuntu11:1.0.1-11:2.0.0~b3-0ubuntu11:2.0.0~rc1-11:2.0.0-11:2.0.0-1ubuntu1
 None known
python-muranoclient
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.7.0-10.7.1-20.7.1-30.8.2-0ubuntu10.8.3-20.8.3-3
 None known

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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