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CVE-2026-78181

ractivejs ractive Keypath Ractive#set prototype pollution

A weakness has been identified in ractivejs ractive up to 1.4.4. Impacted is the function Ractive#set of the component Keypath Handler. Executing a manipulation can lead to improperly controlled modification of object prototype attributes. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Ractivejs
Products
Ractive
CVE-2026-18420

RCE via Prototype Pollution in OpenSearch Dashboards

Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution.  To remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Aws Opensearch
Products
Amazon Opensearch Service Opensearch Dashboards
CVE-2026-78654

cleverbrush framework/deep deepExtend.ts deepExtend prototype pollution

A vulnerability has been found in cleverbrush framework and deep up to 4.4.0. This impacts the function deepExtend of the file libs/deep/src/deepExtend.ts. The manipulation leads to improperly controlled modification of object prototype attributes. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. Upgrading to version 4.4.1 will fix this issue. The identifier of the patch is 810398c1308c500c3b8b6af380b5a89371389327. You should upgrade the affected component.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Cleverbrush
Products
Deep Framework
CVE-2026-71553

ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS

ApostropheCMS is an open-source Node.js content management system. In 4.32.0 and earlier, PATCH /api/v1/article/:id accepts the inherited path toString.call and passes it through the utility module to apos.util.set() and apos.util.get(), allowing an authenticated editor to overwrite the shared Object.prototype.toString function's call property and cause a persistent process-wide denial of service until restart.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Apostrophecms
Products
Apostrophecms
CVE-2026-78180

alibaba-fusion next deepMerge index.tsx ConfigProvider.getContextProps prototype pollution

A security flaw has been discovered in alibaba-fusion next up to 1.27.34. This issue affects the function ConfigProvider.getContextProps of the file components/dialog/index.tsx of the component deepMerge. Performing a manipulation of the argument locale results in improperly controlled modification of object prototype attributes. The attack may be initiated remotely. The reported GitHub issue was closed automatically due to inactivity.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Alibaba-fusion Next
Products
Next Next
CVE-2026-78179

rexrainbow phaser3-rex-notes BehaviorTree Blackboard Data SetValue.js SetValue prototype pollution

A vulnerability was identified in rexrainbow phaser3-rex-notes up to 1.80.17. This vulnerability affects the function SetValue of the file plugins/utils/object/SetValue.js of the component BehaviorTree Blackboard Data Interface. Such manipulation of the argument key leads to improperly controlled modification of object prototype attributes. The attack can be launched remotely.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Rexrainbow
Products
Phaser3-rex-notes
CVE-2026-73088

Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)

Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, normalizeStats() in node.js, reached unconditionally through getStat() and loadStat() on every browserslist() call, processes untrusted browserslist-stats.json, opts.stats, and CLI --stats data with an unguarded for...in loop and plain-object bracket access and assignment, allowing inherited Object.prototype keys including __proto__, toString, valueOf, constructor, hasOwnProperty, and isPrototypeOf to cause an uncaught TypeError or modify the prototype of the returned normalized object. This issue is fixed in version 4.28.7.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Browserslist Project Redhat
Products
Browserslist Hummingbird
CVE-2026-73562

Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOne(filter, req.body) can exploit Mongoose update casting with a __proto__.x dotted path under $set. Schema.prototype.path and Schema.prototype._getPathType can treat inherited properties of schema.paths and schema.nested as schema types, allowing the casting process to set $fullPath and $parentSchemaDocArray on Object.prototype before throwing. This prototype pollution makes those properties visible on newly created objects and can cause application integrity and availability impacts. This issue is fixed in versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Automattic
Products
Mongoose
CVE-2026-73647

Quasar Framework: Prototype pollution in Quasar extend() utility

Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep merges without rejecting an own __proto__ property. The merge could descend into the prototype object and write attacker-controlled properties to Object.prototype in the same JavaScript process. Applications that passed user-controlled or partially user-controlled objects to extend() could experience logic bypass, unsafe default-option injection, denial of service, or other application-specific impact when polluted properties were later consumed. This issue is fixed in version 2.22.0.

CVSS 3.1 · 5.6 Medium EPSS < 1% KEV · Not listed
Vendors
Quasarframework
Products
Quasar
CVE-2024-21489

uplot: Prototype Pollution in uplot

Versions of the package uplot before 1.6.31 are vulnerable to Prototype Pollution via the uplot.assign function due to missing check if the attribute resolves to the object prototype.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Leeoniya Redhat
Products
Uplot Rhel Aus Rhel E4s and 1 more
CVE-2026-48170

scimPatch vulnerable to prototype pollution via unfiltered keys in patch

`scim-patch`, a library to perform SCIM patch, prior to version 0.9.1 performs prototype pollution when applying a SCIM PATCH operation whose `value` object contains a key like `"__proto__.someProp"`. After one such patch, `Object.prototype.someProp` is set process-wide, affecting every plain object in the Node process. Any service that calls `scimPatch()` on attacker-controlled JSON (i.e. any SCIM endpoint accepting `PATCH` from an external IdP) is exploitable on a stock Node runtime. Version 0.9.1 contains a patch. A workaround is available. Calling `Object.freeze(Object.prototype)` (and the same on `Array.prototype`, `Function.prototype`) at process startup neutralizes this class of bug — assignment to a frozen prototype becomes a silent no-op in sloppy mode or a `TypeError` in strict mode. Node's `--frozen-intrinsics` flag does this for built-ins automatically.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Thomaspoignant
Products
Scim-patch
CVE-2026-71437

Mermaid Architecture diagrams are vulnerable to prototype pollution

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.

CVSS 4.0 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Mermaid Project
Products
Mermaid
CVE-2026-71438

Mermaid configuration APIs allow prototype pollution

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's internal config using the assignWithDepth deep-merge helper, which is vulnerable to prototype pollution. This is only exploitable if an application forwards untrusted data directly into one of these configuration entry points, which is outside their documented usage; diagram-supplied configuration (e.g. %%{init: {}}%% or YAML frontmatter) is not affected. This issue is fixed in versions 10.9.8 and 11.16.1.

CVSS 4.0 · 2.4 Low EPSS < 1% KEV · Not listed
Vendors
Mermaid Project
Products
Mermaid
CVE-2026-14574

Prototype Pollution via Preference Merge in Eclipse Theia Settings

In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia/core` recursively merges preference values without rejecting prototype-related keys (`__proto__`, `constructor`, `prototype`). Because this function is invoked by `PreferenceServiceImpl.doResolve` for every preference resolution across scopes (default, user, workspace, folder), a crafted preference value in a workspace settings file (`.theia/settings.json` or `.vscode/settings.json`) can pollute `Object.prototype` when the user opens the workspace, potentially altering application logic across the Theia process.

CVSS 4.0 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Eclipse
Products
Theia
CVE-2026-16266

Prototype Pollution via expandKey in mongo-object

Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Longshotlabs
Products
Mongo-object
CVE-2026-54737

@phun-ky/defaults-deep Has a Prototype Pollution issue via Unsafe Recursive Property Merging

@phun-ky/defaults-deep is a library like lodash defaultsDeep with array preservation and no lodash dependency. Prior to 2.0.5, defaultsDeep() recursively merges user-supplied objects without filtering proto, constructor, and prototype, allowing properties to be written to Object.prototype. This issue is fixed in version 2.0.5.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Phun-ky
Products
Defaults-deep
CVE-2026-14893

IBM Instana Observability is affected by multiple Prototype Pollution within Instana Agent container image

IBM Observability with Instana (Agent) Build 1.0.303 through 1.0.320 IBM Instana Node.js tracer component @instana/core version 6.2.1 is vulnerable to prototype pollution through its configuration normalization API.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ibm
Products
Observability With Instana Observability With Instana Agent
CVE-2026-46681

@nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty

@nevware21/ts-utils is a comprehensive TypeScript/JavaScript utility library. Prior to version 0.14.0, the _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (__proto__, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application. Version 0.14.0 patches the issue.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Nevware21
Products
Ts-utils
CVE-2026-66922

Pivotick Prototype-Key Collision in Tree Layout and Cycle Detection Allows Graph Manipulation and Denial of Service

Pivotick used plain JavaScript objects as lookup tables indexed by caller-controlled graph node identifiers in its tree-layout and cycle-detection components. Node identifiers matching properties inherited from Object.prototype, such as constructor, toString, or __proto__, were not handled as ordinary identifiers. These values could be interpreted as existing inherited properties, resolve to values of an unexpected type, or—in the case of __proto__ assignments—modify the prototype of an internal lookup object. An attacker who can supply graph data containing crafted node identifiers could consequently cause nodes or edges to be silently omitted, produce incorrect hierarchy levels, bypass or corrupt cycle-detection results, or trigger an exception that interrupts graph processing and rendering. This affects the integrity of graph visualisations and analytics and may cause a client-side denial-of-service condition. The affected code also failed to safely handle edges whose source node was absent from the supplied node set. Furthermore, calculating the maximum tree depth by spreading all level values into Math.max() could exceed the JavaScript function-argument limit when processing a sufficiently large graph, resulting in an exception and denial of service. The patch replaces identifier-keyed plain objects with Map instances, ignores invalid edges during tree construction, and calculates the maximum depth iteratively.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Pivotick
Products
Pivotick
CVE-2026-45325

Gestor de Oferta: Prototype pollution in @tmlmobilidade/utils setValueAtPath

Gestor de Oferta is a web application for managing mobility service offerings. Prior to 20260509.0340.15, @tmlmobilidade/utils has a prototype pollution vulnerability in setValueAtPath() in packages/utils/src/generic/value-at-path.ts because unsafe path segments are not blocked. This issue is fixed in version 20260509.0340.15.

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Tmlmobilidade
Products
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