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OpenAdvisories

Weakness (CWE)

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes

Variant Incomplete

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

How to prevent it (5 mitigations)

  1. Implementation

    By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.

  2. Architecture and Design

    By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.

  3. Implementation

    When handling untrusted objects, validating using a schema can be used.

  4. Implementation

    By using an object without prototypes (via Object.create(null) ), adding object prototype attributes by accessing the prototype via the special attributes becomes impossible, mitigating this weakness.

  5. Implementation

    Map can be used instead of objects in most cases. If Map methods are used instead of object attributes, it is not possible to access the object prototype or modify it.

Source: MITRE CWE-1321

All Critical High Medium Low Exploited only Public exploit

10 results · Clear filters · Feed

  • Medium 6.3
    CVE-2026-15598 Public exploit

    antv layout object.js setNestedValue prototype pollution

    A weakness has been identified in antv layout 2.0.0. This impacts the function setNestedValue in the library lib/util/object.js. Executing a manipulation of the argument path can lead to improperly controlled modification of object prototype attributes. The a…

    antv layout
  • Medium 5.0
    CVE-2026-2964 Public exploit

    higuma web-audio-recorder-js Dynamic Config Handling WebAudioRecorder.js extend prototype pollution

    A vulnerability was identified in higuma web-audio-recorder-js 0.1/0.1.1. Impacted is the function extend in the library lib/WebAudioRecorder.js of the component Dynamic Config Handling. Such manipulation leads to improperly controlled modification of object …

    higuma web-audio-recorder-js
  • Medium 6.9
    CVE-2025-13465 Public exploit

    Prototype Pollution Vulnerability in Lodash _.unset and _.omit functions

    The _.unset and _.omit functions in Lodash are vulnerable to prototype pollution. An attacker can pass crafted paths which cause Lodash to delete methods from global prototypes. The issue permits deletion of properties but does not allow overwriting their ori…

    lodash lodash lodash-amd lodash-es Debian Ubuntu npm
  • Medium 5.7
    CVE-2024-57708 Public exploit

    An issue in OneTrust SDK v.6.33.0 allows a local attacker to cause a denial of service via the Object.setPrototypeOf, _…

  • Medium 4.0
    CVE-2024-33883 Public exploit

    ejs lacks certain pollution protection

    The ejs (aka Embedded JavaScript templates) package before 3.1.10 for Node.js lacks certain pollution protection.

    node-ejs ejs node-ejs Debian Ubuntu npm
  • Medium 6.3
    CVE-2024-23339 Public exploit

    hoolock does not block Prototype pollution with object-path related utilities

    hoolock is a suite of lightweight utilities designed to maintain a small footprint when bundled. Starting in version 2.0.0 and prior to version 2.2.1, utility functions related to object paths (`get`, `set`, and `update`) did not block attempts to access or a…

    elijahharry hoolock hoolock npm
  • Medium 6.5
    CVE-2023-26136 Public exploit

    tough-cookie Prototype Pollution vulnerability

    Versions of the package tough-cookie before 4.1.3 are vulnerable to Prototype Pollution due to improper handling of Cookies when using CookieJar in rejectPublicSuffixes=false mode. This issue arises from the manner in which the objects are initialized.

    tough-cookie node-tough-cookie node-tough-cookie Debian Ubuntu npm
  • Medium 5.6
    CVE-2021-23383 Public exploit

    Prototype Pollution

    The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.

    handlebars node-handlebars node-handlebars Debian Ubuntu npm
  • Medium 5.6
    CVE-2020-7598 Public exploit

    Prototype Pollution in minimist

    minimist before 1.2.2 could be tricked into adding or modifying properties of Object.prototype using a "constructor" or "__proto__" payload.

    minimist node-minimist node-minimist Debian Ubuntu npm
  • Medium 6.1
    CVE-2019-11358 Public exploit EPSS 87%

    XSS in jQuery as used in Drupal, Backdrop CMS, and other products

    jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source object contained an enumerable __proto__ property, it could extend the native Obj…

    mediawiki mediawiki django drupal/core Debian Ubuntu Alpine npm Packagist Maven PyPI NuGet RubyGems