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PYSEC-2020-176
Vulnerability from pysec - Published: 2020-02-19 04:15 - Updated: 2020-03-01 00:15
VLAI
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Impacted products
| Name | purl | pyyaml | pkg:pypi/pyyaml |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "pyyaml",
"purl": "pkg:pypi/pyyaml"
},
"ranges": [
{
"events": [
{
"introduced": "5.1"
},
{
"fixed": "5.2b1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.1",
"5.1.1",
"5.1.2"
]
}
],
"aliases": [
"CVE-2019-20477",
"GHSA-3pqx-4fqf-j49f"
],
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "PYSEC-2020-176",
"modified": "2020-03-01T00:15:00Z",
"published": "2020-02-19T04:15:00Z",
"references": [
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H/"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN/"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
}
]
}
BREW-MESA-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-10 00:30 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mesa",
"purl": "pkg:brew/mesa"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "26.2.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mesa-CVE-2019-20477",
"modified": "2026-09-10T00:30:32Z",
"published": "2026-08-13T17:13:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MISTRAL-VIBE-CVE-20… (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:31 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mistral-vibe",
"purl": "pkg:brew/mistral-vibe"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.24.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mistral-vibe-CVE-2019-20477",
"modified": "2026-09-10T00:31:16Z",
"published": "2026-08-13T17:14:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MK-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mk",
"purl": "pkg:brew/mk"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.0_13"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mk-CVE-2019-20477",
"modified": "2026-09-10T00:32:13Z",
"published": "2026-08-13T17:14:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MKDOCS-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 19:59 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mkdocs",
"purl": "pkg:brew/mkdocs"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.1_3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mkdocs-CVE-2019-20477",
"modified": "2026-09-10T19:59:01Z",
"published": "2026-08-13T17:14:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MKDOCS-MATERIAL-CVE… (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mkdocs-material",
"purl": "pkg:brew/mkdocs-material"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "9.7.7"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mkdocs-material-CVE-2019-20477",
"modified": "2026-09-10T00:32:13Z",
"published": "2026-08-13T17:14:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MKTXP-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mktxp",
"purl": "pkg:brew/mktxp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.19"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mktxp-CVE-2019-20477",
"modified": "2026-09-10T00:32:14Z",
"published": "2026-08-13T17:14:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MLX-LM-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mlx-lm",
"purl": "pkg:brew/mlx-lm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.31.3_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mlx-lm-CVE-2019-20477",
"modified": "2026-09-10T00:32:14Z",
"published": "2026-08-13T17:14:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MOLECULE-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "molecule",
"purl": "pkg:brew/molecule"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "26.8.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-molecule-CVE-2019-20477",
"modified": "2026-09-10T00:32:15Z",
"published": "2026-08-13T17:14:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MOTO-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:32 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "moto",
"purl": "pkg:brew/moto"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.2.2_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-moto-CVE-2019-20477",
"modified": "2026-09-10T00:32:37Z",
"published": "2026-08-13T17:14:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
BREW-MYCLI-CVE-2019-20477 (GHSA-3PQX-4FQF-J49F)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:16 – Updated: 2026-09-10 00:35 – Source website
VLAI
Summary
Deserialization of Untrusted Data in PyYAML
Details
PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.
Severity
9.8 (Critical)
References
| URL | Type | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyyaml",
"resource_purl": "pkg:pypi/pyyaml@6.0.3",
"upstream_fixed_in": "5.2"
},
"package": {
"ecosystem": "Homebrew",
"name": "mycli",
"purl": "pkg:brew/mycli"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.13.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyyaml@6.0.3",
"name": "pyyaml",
"resource": "pyyaml",
"strategy": "registry",
"subject_version": "6.0.3"
}
]
},
"details": "PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.",
"id": "BREW-mycli-CVE-2019-20477",
"modified": "2026-09-10T00:35:46Z",
"published": "2026-08-13T17:16:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20477"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-3pqx-4fqf-j49f"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyyaml/PYSEC-2020-176.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/yaml/pyyaml"
},
{
"type": "WEB",
"url": "https://github.com/yaml/pyyaml/blob/master/CHANGES"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/download/47655"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Deserialization of Untrusted Data in PyYAML",
"upstream": [
"GHSA-3pqx-4fqf-j49f",
"CVE-2019-20477",
"PYSEC-2020-176"
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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