CVE-2019-10795Public exploitNetwork attack vector

Prototype pollution via inherited property traversal

Published Feb 18, 2020 · Updated Aug 4, 2024

Prototype pollution in undefsafe before 2.0.3 allows attackers to modify Object.prototype through a crafted property path. The a function follows inherited proto path segments and assigns the supplied value without requiring each segment to be an own property. A calling application must pass an attacker-controlled path and value; the resulting process-wide properties can alter downstream application behavior.

CVSS severity6.3
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Prototype pollution in undefsafe before 2.0.3 allows attackers to modify Object.prototype through a crafted property path. The a function follows inherited proto path segments and assigns the supplied value without requiring each segment to be an own property. A calling application must pass an attacker-controlled path and value; the resulting process-wide properties can alter downstream application behavior.

The record

CVE
CVE-2019-10795
Published
Feb 18, 2020
Updated
Aug 4, 2024
Vendor
Snyk
Product
undefsafe
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=All versions prior to version 2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Snyk · undefsafeversion=All versions prior to version 2.0.3

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
6.3SnykCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo