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Vulnerability details: VCID-2wh2-rac2-53ax
Vulnerability ID VCID-2wh2-rac2-53ax
Aliases CVE-2020-14343
GHSA-8q59-q68h-6hv4
PYSEC-2021-142
Summary A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-20 Improper Input Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14343.json
epss 0.13704 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.13704 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.13704 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.13704 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.13704 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
epss 0.1402 https://api.first.org/data/v1/epss?cve=CVE-2020-14343
cvssv3.1 9.8 https://bugzilla.redhat.com/show_bug.cgi?id=1860466
cvssv4 9.3 https://bugzilla.redhat.com/show_bug.cgi?id=1860466
generic_textual CRITICAL https://bugzilla.redhat.com/show_bug.cgi?id=1860466
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 9.8 https://github.com/advisories/GHSA-8q59-q68h-6hv4
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-8q59-q68h-6hv4
cvssv4 9.3 https://github.com/advisories/GHSA-8q59-q68h-6hv4
generic_textual CRITICAL https://github.com/advisories/GHSA-8q59-q68h-6hv4
cvssv3.1 9.8 https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
cvssv4 9.3 https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
generic_textual CRITICAL https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
cvssv3.1 9.8 https://github.com/SeldonIO/seldon-core/issues/2252
cvssv4 9.3 https://github.com/SeldonIO/seldon-core/issues/2252
generic_textual CRITICAL https://github.com/SeldonIO/seldon-core/issues/2252
cvssv3.1 9.8 https://github.com/yaml/pyyaml
cvssv4 9.3 https://github.com/yaml/pyyaml
generic_textual CRITICAL https://github.com/yaml/pyyaml
cvssv3.1 9.8 https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
cvssv4 9.3 https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
generic_textual CRITICAL https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
cvssv3.1 9.8 https://github.com/yaml/pyyaml/issues/420
cvssv4 9.3 https://github.com/yaml/pyyaml/issues/420
generic_textual CRITICAL https://github.com/yaml/pyyaml/issues/420
cvssv3.1 9.8 https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
cvssv4 9.3 https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
generic_textual CRITICAL https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2020-14343
cvssv4 9.3 https://nvd.nist.gov/vuln/detail/CVE-2020-14343
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2020-14343
cvssv3.1 9.8 https://pypi.org/project/PyYAML
cvssv4 9.3 https://pypi.org/project/PyYAML
generic_textual CRITICAL https://pypi.org/project/PyYAML
archlinux Medium https://security.archlinux.org/AVG-1459
cvssv3.1 9.8 https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv4 9.3 https://www.oracle.com/security-alerts/cpuapr2022.html
generic_textual CRITICAL https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv3.1 9.8 https://www.oracle.com/security-alerts/cpujul2022.html
cvssv4 9.3 https://www.oracle.com/security-alerts/cpujul2022.html
generic_textual CRITICAL https://www.oracle.com/security-alerts/cpujul2022.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14343.json
https://api.first.org/data/v1/epss?cve=CVE-2020-14343
https://bugzilla.redhat.com/show_bug.cgi?id=1860466
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14343
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-8q59-q68h-6hv4
https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
https://github.com/SeldonIO/seldon-core/issues/2252
https://github.com/yaml/pyyaml
https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
https://github.com/yaml/pyyaml/issues/420
https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
https://nvd.nist.gov/vuln/detail/CVE-2020-14343
https://pypi.org/project/PyYAML
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
966233 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=966233
AVG-1459 https://security.archlinux.org/AVG-1459
GLSA-202402-33 https://security.gentoo.org/glsa/202402-33
RHSA-2021:2583 https://access.redhat.com/errata/RHSA-2021:2583
RHSA-2021:4702 https://access.redhat.com/errata/RHSA-2021:4702
USN-4940-1 https://usn.ubuntu.com/4940-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14343.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=1860466
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=1860466
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/advisories/GHSA-8q59-q68h-6hv4
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/advisories/GHSA-8q59-q68h-6hv4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2021-142.yaml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/SeldonIO/seldon-core/issues/2252
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/SeldonIO/seldon-core/issues/2252
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/yaml/pyyaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/yaml/pyyaml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/yaml/pyyaml/commit/a001f2782501ad2d24986959f0239a354675f9dc
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/yaml/pyyaml/issues/420
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/yaml/pyyaml/issues/420
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://github.com/yaml/pyyaml/issues/420#issuecomment-663673966
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14343
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14343
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://pypi.org/project/PyYAML
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://pypi.org/project/PyYAML
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.oracle.com/security-alerts/cpuapr2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://www.oracle.com/security-alerts/cpuapr2022.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.94257
EPSS Score 0.13704
Published At April 9, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:43:18.018012+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/pyyaml/PYSEC-2021-142.yaml 38.0.0