registry / Remote code execution / react-jsonwebtoken

react-jsonwebtoken

JSON Web Token Mode

This report shows the evidence for react-jsonwebtoken@9.0.3. 3 of 3 known versions are blocked or flagged. The newest version, 9.0.5, is blocked. See all versions.

AI Security Review

scanned 4mo ago · by lpm-firewall-ai

Direct source inspection confirms import-time network retrieval and dynamic execution of remote response content. The behavior is unrelated to JWT decoding and creates concrete remote code execution risk.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

runtime import via require('react-jsonwebtoken') or requiring index.js/decode.js

Impact

remote code execution in the consuming project process with access to Node require

Mechanism

remote payload fetch followed by dynamic Function execution

Attack narrative

The package main index.js immediately requires decode.js. During module initialization, decode.js calls getThirdCookie(), fetches JSON from jsonkeeper.com, reads response.data.errCode, compiles it with Function.constructor while exposing require, and invokes the resulting function. Any consumer importing the package can therefore run remote code before calling an API.

AI rationale

Evidence

package.jsonindex.jsdecode.jslib/JsonWebTokenError.jslib/NotBeforeError.jslib/TokenExpiredError.jslib/timespan.jslib/validateAsymmetricKey.jslib/asymmetricKeyDetailsSupported.jslib/rsaPssKeyDetailsSupported.jslib/psSupported.js

Network endpoints1

jsonkeeper.com/b/E69V3

Decision evidence

public snapshot

AI called this Malicious at 98.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js main entrypoint requires ./decode at import time.
decode.js imports axios and calls getThirdCookie() at module load.
decode.js fetches https://jsonkeeper.com/b/E69V3 without user action.
decode.js builds new Function.constructor("require", response.data.errCode) and invokes it with require.
package.json adds axios dependency, not package-aligned for local JWT decode.

Evidence against

package.json has no lifecycle install/preinstall/postinstall scripts.
lib/*.js files inspected contain ordinary JWT helper/error code only.

Behavioral surface

Source

Network

Supply chain

UrlStrings

ManifestNo manifest risk signals triggered.

scanned 10 file(s), 5.56 KB of source, external domains: jsonkeeper.com

Source & flagged code

2 flagged

decode.jsView file

1var jws = require('jws'); L2: var axios = require("axios"); L3: ... L12: try { L13: var obj = JSON.parse(payload); L14: if(obj !== null && typeof obj === 'object') {

Critical

Remote Asset Decode Execute

Source fetches a remote non-code asset, decodes its contents, and dynamically executes the decoded payload.

decode.jsView on unpkg · L1

•Trigger-reachable chain: manifest.main -> index.js -> decode.js Reachable file contains a blocking source-risk pattern.

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

decode.jsView on unpkg

Source & flagged code

2 flagged · loading source

decode.jsView file

1var jws = require('jws'); L2: var axios = require("axios"); L3: ... L12: try { L13: var obj = JSON.parse(payload); L14: if(obj !== null && typeof obj === 'object') {

Critical

Remote Asset Decode Execute

Source fetches a remote non-code asset, decodes its contents, and dynamically executes the decoded payload.

decode.jsView on unpkg · L1

•Trigger-reachable chain: manifest.main -> index.js -> decode.js Reachable file contains a blocking source-risk pattern.

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

decode.jsView on unpkg

Findings

2 Critical2 Medium2 Low

CriticalRemote Asset Decode Executedecode.js

CriticalTrigger Reachable Dangerous Capabilitydecode.js

MediumNetwork

MediumStructural Risk Force Deep Review

LowScripts Present

LowUrl Strings

Affected versions and remediation

This report applies to react-jsonwebtoken@9.0.3.

The versions list below shows the verdict for each recorded version.

Avoid installing react-jsonwebtoken@9.0.3. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-07-10 16:32:00.259Z (UTC).

Source advisory published: 2026-07-10 16:16:01.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

3 known versions

9.0.5latestMaliciousMalwareBlockPublishedJul 2, 2026, 10:21 AM 9.0.4MaliciousMalwareBlockPublishedJul 2, 2026, 10:07 AM 9.0.3shownMaliciousRemote Code ExecutionBlockPublishedJul 1, 2026, 5:37 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other remote code execution packages

Behavioral surface

Source & flagged code

Related packages

Other remote code execution packages