MAL-2026-10116: Malicious code in jwtmethod (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3dbd06d83019ce10a1c0da788fc10633f55f9f6c82058ca6841c4650b5611afb) On module load, jwtmethod's decode.js executes a top-level routine that performs an HTTPS GET to https://jsonkeeper.com/b/E69V3 and passes the response body to `new Function.constructor('require', errCode)`, then invokes the resulting function with the host's `require`. The fetched content is attacker-controlled (jsonkeeper.com is a mutable third-party paste host) and is executed with full Node capabilities, giving the attacker arbitrary code execution on the installer's machine the moment any consumer imports the package. Package metadata is forged to impersonate the auth0/jsonwebtoken ecosystem: package.json sets `author: auth0` and points `repository`/`bugs` at github.com/radix-ui/primitives, and README.md is the unrelated `react-text` documentation from radix-ui — a lure designed to entice installers looking for a JWT library.
AI Analysis
Technical Summary
The jwtmethod npm package (version 1.1.10) includes a top-level routine in decode.js that performs an HTTPS GET request to a mutable third-party paste host (jsonkeeper.com). The response body is passed to a dynamically constructed function which is executed with the host's require context, enabling arbitrary code execution on the installer's machine immediately upon importing the package. The package metadata is falsified to mimic the auth0/jsonwebtoken ecosystem, including author and repository fields, and the README is unrelated content from another project, designed to lure users seeking JWT functionality.
Potential Impact
Any user who installs and imports jwtmethod version 1.1.10 is at risk of arbitrary code execution on their system due to the execution of attacker-controlled code with full Node.js privileges. This can lead to complete compromise of the host environment where the package is used.
Mitigation Recommendations
No official patch or remediation is currently available. Users should avoid installing or using jwtmethod version 1.1.10. Verify package authenticity before installation and prefer well-known, trusted JWT libraries. Monitor for updates from the package maintainer or npm advisories for any future fixes.
MAL-2026-10116: Malicious code in jwtmethod (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3dbd06d83019ce10a1c0da788fc10633f55f9f6c82058ca6841c4650b5611afb) On module load, jwtmethod's decode.js executes a top-level routine that performs an HTTPS GET to https://jsonkeeper.com/b/E69V3 and passes the response body to `new Function.constructor('require', errCode)`, then invokes the resulting function with the host's `require`. The fetched content is attacker-controlled (jsonkeeper.com is a mutable third-party paste host) and is executed with full Node capabilities, giving the attacker arbitrary code execution on the installer's machine the moment any consumer imports the package. Package metadata is forged to impersonate the auth0/jsonwebtoken ecosystem: package.json sets `author: auth0` and points `repository`/`bugs` at github.com/radix-ui/primitives, and README.md is the unrelated `react-text` documentation from radix-ui — a lure designed to entice installers looking for a JWT library.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The jwtmethod npm package (version 1.1.10) includes a top-level routine in decode.js that performs an HTTPS GET request to a mutable third-party paste host (jsonkeeper.com). The response body is passed to a dynamically constructed function which is executed with the host's require context, enabling arbitrary code execution on the installer's machine immediately upon importing the package. The package metadata is falsified to mimic the auth0/jsonwebtoken ecosystem, including author and repository fields, and the README is unrelated content from another project, designed to lure users seeking JWT functionality.
Potential Impact
Any user who installs and imports jwtmethod version 1.1.10 is at risk of arbitrary code execution on their system due to the execution of attacker-controlled code with full Node.js privileges. This can lead to complete compromise of the host environment where the package is used.
Mitigation Recommendations
No official patch or remediation is currently available. Users should avoid installing or using jwtmethod version 1.1.10. Verify package authenticity before installation and prefer well-known, trusted JWT libraries. Monitor for updates from the package maintainer or npm advisories for any future fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-10116
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a50ba2668715ace4357c215
Added to database: 07/10/2026, 09:23:50 UTC
Last enriched: 07/10/2026, 09:27:08 UTC
Last updated: 07/10/2026, 09:29:15 UTC
Views: 3
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