critical
CVE-2017-18342
PyYAML: yaml.load() API could execute arbitrary code
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, GHSA, Photon OS. Rated lower by Red Hat (high), Oracle (high).
Description
In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function has been deprecated in version 5.1 and the 'UnsafeLoader' has been introduced for backward compatibility with the function.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 1.0 | PyYAML | 3.12-3.ph1 |
| Photon OS 2.0 | PyYAML | 3.12-3.ph2 |
| Photon OS 3.0 | PyYAML | 3.13-3.ph3 |
| pip::GitHub Security Advisory pip | pyyaml | 5.1 |
| debian 11 | pyyaml | 5.1.2-1 |
| debian 12 | pyyaml | 5.1.2-1 |
| debian 13 | pyyaml | 5.1.2-1 |
| debian 14 | pyyaml | 5.1.2-1 |
| echo | pyyaml | 5.1.2-1 |
| Oracle Linux 8 | ol-automation-manager, ol-automation-manager-cli, python3-olamkit | 1.0.2-1.el8 |
| Red Hat | PyYAML, python2-pyyaml, python27-PyYAML and 3 more | no fix listed |
Show all 18 entries from 11 sources
| Source | Package | Fixed in |
|---|---|---|
| Photon OS 1.0 | PyYAML | 3.12-3.ph1 |
| Photon OS 2.0 | PyYAML | 3.12-3.ph2 |
| Photon OS 3.0 | PyYAML | 3.13-3.ph3 |
| pip::GitHub Security Advisory pip | pyyaml | 5.1 |
| debian 11 | pyyaml | 5.1.2-1 |
| debian 12 | pyyaml | 5.1.2-1 |
| debian 13 | pyyaml | 5.1.2-1 |
| debian 14 | pyyaml | 5.1.2-1 |
| echo | pyyaml | 5.1.2-1 |
| Oracle Linux 8 | ol-automation-manager | 1.0.2-1.el8 |
| Oracle Linux 8 | ol-automation-manager-cli | 1.0.2-1.el8 |
| Oracle Linux 8 | python3-olamkit | 1.0.2-1.el8 |
| Red Hat | PyYAML | no fix listed |
| Red Hat | python2-pyyaml | no fix listed |
| Red Hat | python27-PyYAML | no fix listed |
| Red Hat | python38-pyyaml | no fix listed |
| Red Hat | python39-pyyaml | no fix listed |
| Red Hat | rh-python36-PyYAML | no fix listed |
References
- https://access.redhat.com/security/cve/CVE-2017-18342
- https://github.com/marshmallow-code/apispec/issues/278
- https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2018-49.yaml
- https://github.com/yaml/pyyaml
- https://github.com/yaml/pyyaml/blob/master/CHANGES
- https://github.com/yaml/pyyaml/commit/7b68405c81db889f83c32846462b238ccae5be80
- https://github.com/yaml/pyyaml/issues/193
- https://github.com/yaml/pyyaml/issues/207#issuecomment-472520007
All 21 references
- https://github.com/yaml/pyyaml/pull/74
- https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
- https://linux.oracle.com/cve/CVE-2017-18342.html
- https://linux.oracle.com/errata/ELSA-2022-9341.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
- https://nvd.nist.gov/vuln/detail/CVE-2017-18342
- https://security.gentoo.org/glsa/202003-45
- https://www.cve.org/CVERecord?id=CVE-2017-18342