Weakness (CWE)
CWE-1321: Improperly Controlled Modification of Object Prototype Attributes
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)
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Implementation
By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
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Architecture and Design
By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
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Implementation
When handling untrusted objects, validating using a schema can be used.
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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.
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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
712 results · Feed
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Critical 9.3
apidoc-core - prototype pollution in api_group.js, api_param_title.js, api_use.js, and api_permission.js worker
Prototype pollution vulnerability in apidoc-core versions 0.2.0 and all subsequent versions allows remote attackers to modify JavaScript object prototypes via malformed data structures, including the “define” property processed by the application, potentially…
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High 8.5
tRPC has possible prototype pollution in `experimental_nextAppDirCaller`
tRPC allows users to build and consume fully typesafe APIs without schemas or code generation. Starting in version 10.27.0 and prior to versions 10.45.3 and 11.8.0, a A prototype pollution vulnerability exists in `@trpc/server`'s `formDataToObject` function, …
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High 8.6
Vuetify Prototype Pollution via Preset options
The Preset configuration https://v2.vuetifyjs.com/en/features/presets feature of Vuetify is vulnerable to Prototype Pollution https://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html due to the internal 'mergeDeep' util…
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Critical 9.1
Elysia vulnerable to prototype pollution with multiple standalone schema validation
Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.0 through 1.4.16 contain a prototype pollution vulnerability in `mergeDeep` after merging results of two standard sche…
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Critical 9.8
CVE-2025-13204
npm package `expr-eval` is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.
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Medium 5.3
js-yaml has prototype pollution in merge (<<)
js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documen…
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Medium 5.9
Rollbar.js Prototype Pollution Vulnerability in merge()
Rollbar.js offers error tracking and logging from Javascript to Rollbar. In versions before 2.26.5 and from 3.0.0-alpha1 to before 3.0.0-beta5, there is a prototype pollution vulnerability in merge(). If application code calls rollbar.configure() with untrust…
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Critical 9.4
--disallow-code-generation-from-strings is not sufficient for isolating untrusted JavaScript in happy-dom
In versions before 20.0.2, it was found that --disallow-code-generation-from-strings is not sufficient for isolating untrusted JavaScript in happy-dom. The untrusted script and the rest of the application still run in the same Isolate/process, so attackers ca…
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High 8.3
sveltekit-superforms Prototype Pollution in `parseFormData` function of `formData.js`
sveltekit-superforms makes SvelteKit forms a pleasure to use. sveltekit-superforms v2.27.3 and prior are susceptible to a prototype pollution vulnerability within the parseFormData function of formData.js. An attacker can inject string and array properties in…
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Medium 6.4
Parse Javascript SDK vulnerable to prototype pollution in `Parse.Object` and internal APIs
Parse Javascript SDK provides access to the powerful Parse Server backend from your JavaScript app. Prior to 7.0.0, injection of malicious payload allows attacker to remotely execute arbitrary code. ParseObject.fromJSON, ParseObject.pin, ParseObject.registerS…
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High 7.5
algoliasearch-helper is vulnerable to Prototype Pollution in _merge()
Versions of the package algoliasearch-helper from 2.0.0-rc1 and before 3.11.2 are vulnerable to Prototype Pollution in the _merge() function in merge.js, which allows constructor.prototype to be written even though doing so throws an error. In the "extreme ed…
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High 7.5
dref is vulnerable to prototype pollution
A prototype pollution in the lib.set function of dref v0.1.2 allows attackers to cause a Denial of Service (DoS) via supplying a crafted payload.
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Medium 6.5
ts-fns has prototype pollution vulnerability
A prototype pollution vulnerability exists in the ts-fns package versions prior to 13.0.7, where insufficient validation of user-provided keys in the assign function allows attackers to manipulate the Object.prototype chain. By leveraging this flaw, adversari…
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Critical 9.8
A vulnerability exists in the 'dagre-d3-es' Node.js package version 7.0.9, specifically within the 'bk' module's addCon…
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Critical 9.8
magix-combine-ex vulnerable to prototype pollution
A Prototype Pollution vulnerability in the util-deps.addFileDepend function of magix-combine-ex versions thru 1.2.10 allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum cons…
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High 7.5
sassdoc-extras vulnerable to prototype pollution
A Prototype Pollution vulnerability in the byGroupAndType function of sassdoc-extras v2.5.1 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.
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Medium 6.5
parse is vulnerable to prototype pollution
parse is a package designed to parse JavaScript SDK. A Prototype Pollution vulnerability in the SingleInstanceStateController.initializeState function of parse version 5.3.0 and before allows attackers to inject properties on Object.prototype via supplying a …
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High 8.6
CSVTOJSON has a prototype pollution vulnerability
The csvtojson package, a tool for converting CSV data to JSON with customizable parsing capabilities, contains a prototype pollution vulnerability in versions prior to 2.0.10. This issue arises due to insufficient sanitization of nested header names during th…
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Medium 6.5
json-schema-editor-visual vulnerable to prototype pollution
json-schema-editor-visual is a package that provides jsonschema editor. A Prototype Pollution vulnerability in the setData and deleteData function of json-schema-editor-visual versions thru 1.1.1 allows attackers to inject or delete properties on Object.proto…
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High 7.5
toggle-array vulnerable to prototype pollution
toggle-array is a package designed to enables a property on the object at the specified index, while disabling the property on all other objects. A Prototype Pollution vulnerability in the enable and disable function of toggle-array v1.0.1 and before allows a…
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Medium 5.3
min-document vulnerable to prototype pollution
A vulnerability exists in the 'min-document' package prior to version 2.19.0, stemming from improper handling of namespace operations in the removeAttributeNS method. By processing malicious input involving the __proto__ property, an attacker can manipulate t…
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High 7.5
spmrc vulnerable to prototype pollution
spmrc is a package that provides the rc manager for spm. A Prototype Pollution vulnerability in the set and config function of spmrc version 1.2.0 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing de…
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High 7.5
web3-core-method is vulnerable to prototype pollution
web3-core-method is a package designed to creates the methods on the web3 modules. A Prototype Pollution vulnerability in the attachToObject function of web3-core-method version 1.10.4 and before allows attackers to inject properties on Object.prototype via s…
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Medium 5.3
messageformat prototype pollution vulnerability
The Runtime components of messageformat package for Node.js before 3.0.2 contain a prototype pollution vulnerability. Due to insufficient validation of nested message keys during the processing of message data, an attacker can manipulate the prototype chain o…
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High 7.5
web3-core-subscriptions has a Prototype Pollution vulnerability
The web3-core-subscriptions is a package designed to manages web3 subscriptions. A Prototype Pollution vulnerability in the attachToObject function of web3-core-subscriptions version 1.10.4 and before allows attackers to inject properties on Object.prototype …
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High 7.5
rollbar vulnerable to prototype pollution
rollbar is a package designed to effortlessly track and debug errors in JavaScript applications. This package includes advanced error tracking features and an intuitive interface to help you identify and fix issues more quickly. A Prototype Pollution vulnerab…
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Medium 6.5
node-cube vulnerable to prototype pollution
The node-cube package (prior to version 5.0.0) contains a vulnerability in its handling of prototype chain initialization, which could allow an attacker to inject properties into the prototype of built-in objects. This issue, categorized under CWE-1321, arise…
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Medium 6.5
counterpart vulnerable to prototype pollution
A vulnerability exists in the 'counterpart' library for Node.js and the browser due to insufficient sanitization of user-controlled input in translation key processing. The affected versions prior to 0.18.6 allow attackers to manipulate the library's translat…
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High 7.5
messageformat has a prototype pollution vulnerability
The messageformat package, an implementation of the Unicode MessageFormat 2 specification for JavaScript, is vulnerable to prototype pollution due to improper handling of message key paths in versions prior to 2.3.0. The flaw arises when processing nested mes…
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High 7.5
mpregular vulnerable to prototype pollution
mpregular is a package that provides a small program development framework based on RegularJS. A Prototype Pollution vulnerability in the mp.addEventHandler function of mpregular version 0.2.0 and before allows attackers to inject properties on Object.prototy…
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High 7.5
csvjson vulnerable to prototype injection
A Prototype Pollution vulnerability in the toCsv function of csvjson versions thru 5.1.0 allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.
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High 8.4
Vulnerability of exposing object heap addresses in the Ark eTS module. Impact: Successful exploitation of this vulnerab…
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High 7.9
Svelte devalue vulnerable to prototype pollution
Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects a…
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High 7.3
@std/toml Prototype Pollution in Node.js and Browser
@std/toml is the Deno Standard Library. Prior to version 1.0.9, an attacker can pollute the prototype chain in Node.js runtime and Browser when parsing untrusted TOML data, thus achieving Prototype Pollution (PP) vulnerability. This is because the library is …
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Critical 10.0CVE-2011-10019 Public exploit
Spreecommerce < 0.60.2 Search Parameter RCE
Spreecommerce versions prior to 0.60.2 contains a remote command execution vulnerability in its search functionality. The application fails to properly sanitize input passed via the search[send][] parameter, which is dynamically invoked using Ruby’s send meth…
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High 8.8
content-security-policy-parser Prototype Pollution Vulnerability May Lead to RCE
content-security-policy-parser parses content security policy directives. A prototype pollution vulnerability exists in versions 0.5.0 and earlier, wherein if a policy name is called __proto__, one can override the Object prototype. This issue has been patche…
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High 7.9
js-toml is vulnerable to Prototype Pollution
js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. In versions below 1.0.2, a prototype pollution vulnerability in js-toml allows a remote attacker to add or modify properties of the global Object.prototype by parsing a malicio…
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High 7.0
nyariv sandboxjs 0.8.23 Prototype Pollution Sandbox Escape DoS
A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain c…
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High 8.8
Linkify 4.3.1 - Prototype Pollution & HTML Attribute Injection (XSS)
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Linkify (linkifyjs) allows XSS Targeting HTML Attributes and Manipulating User-Controlled Variables.This issue affects Linkify: from 4.3.1 before 4.3.2.
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Medium 6.1
pdfme has Sandbox Escape and Prototype Pollution vulnerabilities in pdfme expression evaluation
pdfme is a TypeScript-based PDF generator and React-based UI. The expression evaluation feature in pdfme 5.2.0 to 5.4.0 contains critical vulnerabilities allowing sandbox escape leading to XSS and prototype pollution attacks. This vulnerability is fixed in 5.…