CVE-2021-23561

Prototype Pollution

View on CVE.org

Published Dec 10, 2021 CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed

Description

All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

comb

affected

Version	Status	Constraints
`0`	affected	< unspecified

Configuration 1 [-]

cpe:2.3:a:c2fo:comb:*:*:*:*:*:node.js:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-2598	All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
Github GHSA	GHSA-vxr4-rxw7-g7v6	Prototype Pollution in comb

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: 1.2% (1.210% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://snyk.io/vuln/SNYK-JS-COMB-1730083

History

No history.

Subscriptions

C2fo Comb

Weaknesses

CWE-1321

Sources

CVE record Updated: Sep 17, 2024, 12:51 AM

Status: PUBLISHED
Assigner: snyk
Published: Dec 10, 2021, 8:05 PM
Updated: Sep 17, 2024, 12:51 AM
Reserved: Jan 8, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 3:38 AM

Status: Modified
Published: Dec 10, 2021, 8:15 PM
Modified: Jun 17, 2026, 3:38 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "comb", "vendor": "n/a", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "0", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Yeting Li"}], "datePublic": "2021-12-10T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"description": "Prototype Pollution", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-12-10T20:05:10.000Z", "orgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "shortName": "snyk"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://snyk.io/vuln/SNYK-JS-COMB-1730083"}], "title": "Prototype Pollution", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "report@snyk.io", "DATE_PUBLIC": "2021-12-10T20:00:20.001665Z", "ID": "CVE-2021-23561", "STATE": "PUBLIC", "TITLE": "Prototype Pollution"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "comb", "version": {"version_data": [{"version_affected": ">=", "version_value": "0"}]}}]}, "vendor_name": "n/a"}]}}, "credit": [{"lang": "eng", "value": "Yeting Li"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Prototype Pollution"}]}]}, "references": {"reference_data": [{"name": "https://snyk.io/vuln/SNYK-JS-COMB-1730083", "refsource": "MISC", "url": "https://snyk.io/vuln/SNYK-JS-COMB-1730083"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:14:08.580Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://snyk.io/vuln/SNYK-JS-COMB-1730083"}]}]}, "cveMetadata": {"assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "assignerShortName": "snyk", "cveId": "CVE-2021-23561", "datePublished": "2021-12-10T20:05:10.380Z", "dateReserved": "2021-01-08T00:00:00.000Z", "dateUpdated": "2024-09-17T00:51:09.796Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "comb", "vendor": "n/a", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "report@snyk.io"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:c2fo:comb:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "D34073F5-4A6B-4EA8-ADD4-805078409C1F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function."}, {"lang": "es", "value": "Todas las versiones del paquete comb son vulnerables a una Contaminaci\u00f3n de Prototipos por medio de la funci\u00f3n deepMerge()"}], "id": "CVE-2021-23561", "lastModified": "2026-06-17T03:38:49.580", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "report@snyk.io", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-10T20:15:08.303", "references": [{"source": "report@snyk.io", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-JS-COMB-1730083"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-JS-COMB-1730083"}], "sourceIdentifier": "report@snyk.io", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1321"}], "source": "nvd@nist.gov", "type": "Primary"}]}