Home/CVE/In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function
CVE

CVE-2017-18342

In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function

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.

CRITICAL · CVSS 9.8 EPSS 0.04807
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-502Deserialization of Untrusted Data
▤

Affected Products & Versions

2
pyyaml< 5.1
fedoraproject fedoraall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI pyyaml CRITICAL fixed in 4.1
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Jun 2018 · 12:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

5
suse-csafopenSUSE-SU-2024:14152-1
suse-csafopenSUSE-SU-2024:14089-1
suse-csafopenSUSE-SU-2024:11108-1
suse-csafopenSUSE-SU-2024:11210-1
suse-csafopenSUSE-SU-2024:11247-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/marshmallow-code/apispec/issues/278Third Party Advisory
https://github.com/yaml/pyyaml/blob/master/CHANGESRelease NotesThird Party Advisory
https://github.com/yaml/pyyaml/issues/193Third Party Advisory
https://github.com/yaml/pyyaml/pull/74PatchThird Party Advisory
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
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