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URL: https://nvd.nist.gov/vuln/detail/CVE-2017-18342

⇱ NVD - CVE-2017-18342

  1. Vulnerabilities

CVE-2017-18342 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/marshmallow-code/apispec/issues/278 CVE, MITRE Third Party Advisory 
https://github.com/yaml/pyyaml/blob/master/CHANGES CVE, MITRE Release Notes  Third Party Advisory 
https://github.com/yaml/pyyaml/issues/193 CVE, MITRE Third Party Advisory 
https://github.com/yaml/pyyaml/pull/74 CVE, MITRE Patch  Third Party Advisory 
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation CVE, MITRE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ CVE, MITRE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ CVE, MITRE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ CVE, MITRE
https://security.gentoo.org/glsa/202003-45 CVE, MITRE Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-502 Deserialization of Untrusted Data 👁 cwe source acceptance level
NIST  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
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Change History

13 change records found show changes

CVE Modified by MITRE 6/16/2026 9:12:39 PM

Action Type Old Value New Value
Added Affected 
[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]

CVE Modified by CVE 11/20/2024 10:19:53 PM

Action Type Old Value New Value
Added Reference 
https://github.com/marshmallow-code/apispec/issues/278
Added Reference 
https://github.com/yaml/pyyaml/blob/master/CHANGES
Added Reference 
https://github.com/yaml/pyyaml/issues/193
Added Reference 
https://github.com/yaml/pyyaml/pull/74
Added Reference 
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation
Added Reference 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
Added Reference 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
Added Reference 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/
Added Reference 
https://security.gentoo.org/glsa/202003-45

CVE Modified by MITRE 5/14/2024 12:31:49 AM

Action Type Old Value New Value

CVE Modified by MITRE 11/06/2023 9:41:54 PM

Action Type Old Value New Value
Added Reference 
MITRE https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load%28input%29-Deprecation [No types assigned]
Added Reference 
MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ [No types assigned]
Added Reference 
MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ [No types assigned]
Added Reference 
MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ [No types assigned]
Removed Reference 
MITRE https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation
Removed Reference 
MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/
Removed Reference 
MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/
Removed Reference 
MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/

Modified Analysis by NIST 10/14/2020 9:23:00 AM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Removed CVSS V3 
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added CWE 
NIST CWE-502
Removed CWE 
NIST CWE-20
Changed CPE Configuration 
OR
 *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*


 
OR
 *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 5.1
Added CPE Configuration 
OR
 *cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
 *cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
 *cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Changed Reference Type 
https://github.com/marshmallow-code/apispec/issues/278 No Types Assigned


 
https://github.com/marshmallow-code/apispec/issues/278 Third Party Advisory
Changed Reference Type 
https://github.com/yaml/pyyaml/issues/193 No Types Assigned


 
https://github.com/yaml/pyyaml/issues/193 Third Party Advisory
Changed Reference Type 
https://github.com/yaml/pyyaml/pull/74 Third Party Advisory


 
https://github.com/yaml/pyyaml/pull/74 Patch, Third Party Advisory
Changed Reference Type 
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation No Types Assigned


 
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation Third Party Advisory
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ Third Party Advisory
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ Third Party Advisory
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ Third Party Advisory
Changed Reference Type 
https://security.gentoo.org/glsa/202003-45 No Types Assigned


 
https://security.gentoo.org/glsa/202003-45 Third Party Advisory

CPE Deprecation Remap by NIST 5/28/2020 9:21:23 AM

Action Type Old Value New Value
Changed CPE Configuration 
OR
 *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:*


 
OR
 *cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:*

CVE Modified by MITRE 3/19/2020 5:15:14 PM

Action Type Old Value New Value
Added Reference 
https://security.gentoo.org/glsa/202003-45 [No Types Assigned]

CVE Modified by MITRE 6/24/2019 3:15:10 PM

Action Type Old Value New Value
Changed Description 
In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used.


 
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.
Added Reference 
https://github.com/marshmallow-code/apispec/issues/278 [No Types Assigned]
Added Reference 
https://github.com/yaml/pyyaml/issues/193 [No Types Assigned]
Added Reference 
https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation [No Types Assigned]

CVE Modified by MITRE 3/29/2019 9:29:00 PM

Action Type Old Value New Value
Added Reference 
https://lists.fedoraproject.org/archives/list/[email protected]/message/JEX7IPV5P2QJITAMA5Z63GQCZA5I6NVZ/ [No Types Assigned]

CVE Modified by MITRE 3/23/2019 12:29:01 AM

Action Type Old Value New Value
Added Reference 
https://lists.fedoraproject.org/archives/list/[email protected]/message/KSQQMRUQSXBSUXLCRD3TSZYQ7SEZRKCE/ [No Types Assigned]

CVE Modified by MITRE 3/21/2019 1:29:00 PM

Action Type Old Value New Value
Added Reference 
https://lists.fedoraproject.org/archives/list/[email protected]/message/M6JCFGEIEOFMWWIXGHSELMKQDD4CV2BA/ [No Types Assigned]

Reanalysis by NIST 1/17/2019 8:06:21 AM

Action Type Old Value New Value
Changed CPE Configuration 
OR
 *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 4.1


 
OR
 *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:*

Initial Analysis by NIST 8/21/2018 8:15:50 AM

Action Type Old Value New Value
Added CVSS V3 
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added CVSS V2 
(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Added CWE 
CWE-20
Added CPE Configuration 
OR
 *cpe:2.3:a:pyyaml_project:pyyaml:*:*:*:*:*:*:*:* versions up to (excluding) 4.1
Changed Reference Type 
https://github.com/yaml/pyyaml/blob/master/CHANGES No Types Assigned


 
https://github.com/yaml/pyyaml/blob/master/CHANGES Release Notes, Third Party Advisory
Changed Reference Type 
https://github.com/yaml/pyyaml/pull/74 No Types Assigned


 
https://github.com/yaml/pyyaml/pull/74 Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2017-18342
NVD Published Date:
06/27/2018
NVD Last Modified:
06/16/2026
Source:
MITRE