Malicious code in ts-eslint-helper (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e5bbed232e0268a791ce846260ce170342eec359bf1a7e84b9514767d77803a1) The package's index.js defines run()/from_str() that recursively walk process.cwd() and match files named.env, env, id.json, config.json, config.toml, Config.toml, and.jsonc, then POST their contents to https://polymarket-clob-service.vercel.app/api/v1 (via axios) with a `{username}@{localIp}` tag prefix and the filename in a header. All operational strings — the destination URL, target filename patterns, header names, and an 8.8.8.8:80 probe used to discover the local IP — are stored as base64 blobs and decoded at runtime through decodeStr(Buffer.from(x,'base64').toString('utf8')) to hide intent. The shipped test.js invokes run(process.env.BACKUP_USERNAME_TAG || 'piterpan') at load, immediately triggering exfiltration in any environment that executes it. The package name mimics the @typescript-eslint tooling ecosystem while shipping empty description/author/keywords and no legitimate functionality matching that name — a lure targeting developers who install what they believe is an ESLint helper. Installing or loading this package causes recursive harvesting and upload of local secrets (.env credentials, API tokens, wallet/config files) to an attacker-controlled endpoint. ## Source: ghsa-malware (d6b82e2790a954188bd1b3babdcd4bb340ee305f3d5e4acd8216774b2a9b7d40) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
AI Analysis
Technical Summary
The ts-eslint-helper package versions 4.0.1 through 4.0.5 include malicious code in index.js that defines functions to recursively scan the process's current working directory for sensitive files such as .env, env, id.json, config.json, config.toml, Config.toml, and .jsonc. It exfiltrates the contents of these files via HTTP POST requests to a hardcoded attacker-controlled URL (https://polymarket-clob-service.vercel.app/api/v1), tagging the data with a username and local IP address. The package uses base64-encoded strings decoded at runtime to conceal the destination URL, target filenames, headers, and a probe to discover the local IP. The test.js script triggers this exfiltration immediately upon loading. The package is a malicious imposter targeting developers expecting legitimate ESLint tooling. Any system with this package installed or running is considered fully compromised, requiring immediate secret and key rotation from a clean environment.
Potential Impact
Installation or execution of this package leads to the theft of local sensitive files containing credentials, API tokens, wallet information, and configuration data. This results in a full compromise of the affected system's secrets and potentially broader security breaches. Because the package grants remote attackers access to sensitive data, all secrets on the compromised system must be considered exposed and rotated. The presence of this package indicates a high risk of ongoing unauthorized access.
Mitigation Recommendations
No official patch or remediation is indicated. The package should be immediately removed from any affected systems. All secrets and keys stored on compromised machines must be rotated from a separate, trusted environment. Due to the full compromise risk, assume that removing the package alone does not guarantee eradication of all malicious artifacts. Conduct a thorough incident response and system integrity verification.
Malicious code in ts-eslint-helper (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e5bbed232e0268a791ce846260ce170342eec359bf1a7e84b9514767d77803a1) The package's index.js defines run()/from_str() that recursively walk process.cwd() and match files named.env, env, id.json, config.json, config.toml, Config.toml, and.jsonc, then POST their contents to https://polymarket-clob-service.vercel.app/api/v1 (via axios) with a `{username}@{localIp}` tag prefix and the filename in a header. All operational strings — the destination URL, target filename patterns, header names, and an 8.8.8.8:80 probe used to discover the local IP — are stored as base64 blobs and decoded at runtime through decodeStr(Buffer.from(x,'base64').toString('utf8')) to hide intent. The shipped test.js invokes run(process.env.BACKUP_USERNAME_TAG || 'piterpan') at load, immediately triggering exfiltration in any environment that executes it. The package name mimics the @typescript-eslint tooling ecosystem while shipping empty description/author/keywords and no legitimate functionality matching that name — a lure targeting developers who install what they believe is an ESLint helper. Installing or loading this package causes recursive harvesting and upload of local secrets (.env credentials, API tokens, wallet/config files) to an attacker-controlled endpoint. ## Source: ghsa-malware (d6b82e2790a954188bd1b3babdcd4bb340ee305f3d5e4acd8216774b2a9b7d40) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The ts-eslint-helper package versions 4.0.1 through 4.0.5 include malicious code in index.js that defines functions to recursively scan the process's current working directory for sensitive files such as .env, env, id.json, config.json, config.toml, Config.toml, and .jsonc. It exfiltrates the contents of these files via HTTP POST requests to a hardcoded attacker-controlled URL (https://polymarket-clob-service.vercel.app/api/v1), tagging the data with a username and local IP address. The package uses base64-encoded strings decoded at runtime to conceal the destination URL, target filenames, headers, and a probe to discover the local IP. The test.js script triggers this exfiltration immediately upon loading. The package is a malicious imposter targeting developers expecting legitimate ESLint tooling. Any system with this package installed or running is considered fully compromised, requiring immediate secret and key rotation from a clean environment.
Potential Impact
Installation or execution of this package leads to the theft of local sensitive files containing credentials, API tokens, wallet information, and configuration data. This results in a full compromise of the affected system's secrets and potentially broader security breaches. Because the package grants remote attackers access to sensitive data, all secrets on the compromised system must be considered exposed and rotated. The presence of this package indicates a high risk of ongoing unauthorized access.
Mitigation Recommendations
No official patch or remediation is indicated. The package should be immediately removed from any affected systems. All secrets and keys stored on compromised machines must be rotated from a separate, trusted environment. Due to the full compromise risk, assume that removing the package alone does not guarantee eradication of all malicious artifacts. Conduct a thorough incident response and system integrity verification.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-6721
- Osv Schema Version
- 1.7.4
- Aliases
- ["GHSA-cr8h-v4vp-m4m8"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a4c342c27e9c797195fa482
Added to database: 07/06/2026, 23:03:08 UTC
Last enriched: 07/07/2026, 00:08:10 UTC
Last updated: 07/18/2026, 17:27:21 UTC
Views: 4
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