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CVE-2017-18342

CRITICAL
9.8
CVSS Score
Published: June 27, 2018 at 12:00 PM UTC
Updated: June 17, 2026 at 01:12 AM UTC
2 products affected across 2 vendorsFedoraPyyaml

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Severity
CRITICAL9.8
Exploit prediction
EPSS 6%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
282930
Pyyaml· Pyyaml
95%
v < 5.1
Affected range stops below 5.1, so it looks safe — our inference, not a vendor statement

References (9)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/marshmallow-code/apispec/issues/278
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/yaml/pyyaml/blob/master/CHANGES
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/yaml/pyyaml/issues/193
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/yaml/pyyaml/pull/74
x_refsource_MISC
Source: [email protected]
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502

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