CVE-2019-10794Public exploitNetwork attack vector

Prototype pollution via inherited __proto__ assignment

Published Feb 18, 2020 · Updated Aug 4, 2024

Prototype pollution in Component component-flatten 1.0.1 and earlier allows attackers to modify Object.prototype through a crafted resolver tree. In traverse(), deps[branch.name] follows the inherited proto accessor, and releases[branch.ref] then assigns the branch to Object.prototype. Exploitation requires a consuming application to pass attacker-controlled tree nodes; the global property changes can corrupt application behavior.

CVSS severity6.3
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Component component-flatten 1.0.1 and earlier allows attackers to modify Object.prototype through a crafted resolver tree. In traverse(), deps[branch.name] follows the inherited proto accessor, and releases[branch.ref] then assigns the branch to Object.prototype. Exploitation requires a consuming application to pass attacker-controlled tree nodes; the global property changes can corrupt application behavior.

The record

CVE
CVE-2019-10794
Published
Feb 18, 2020
Updated
Aug 4, 2024
Vendor
Component
Product
component-flatten
Classifications
CWE-74, CWE-1321
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Component · component-flattenversion=All versions

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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