Security Advisory: SYNCRAFT-SEC-2026-001

Advisory Metadata	Details
Advisory ID	`SYNCRAFT-SEC-2026-001`
Date Published	August 22, 2026
Severity	Critical (CVSS v3.1: 9.8)
Vulnerability Type	Supply-Chain Compromise / Unauthorized Malicious Package Release
Threat Campaign	PolinRider (also tracked under the Contagious Interview campaign)
Remediation Status	Resolved & Remediated in v0.4.2

Executive Summary

On August 22, 2026, version 0.4.1 of @syncraft-labs/core, @syncraft-labs/react, and @syncraft-labs/vue was compromised and published to the NPM registry containing an unauthorized obfuscated payload linked to the PolinRider threat actor campaign.

No source code in the GitHub git repository branches was modified or altered. The malicious payload was injected exclusively into the compiled distribution artifacts (dist/index.js) during an unauthorized publishing process initiated from stolen maintainer credentials.

All infected packages were immediately deprecated on NPM within hours of detection. A verified clean version 0.4.2 was built in an isolated environment and published, completely removing the malicious artifacts and locking down publication infrastructure.

Affected Packages & Versions

Package	Compromised Version	Clean / Patched Versions	Status
`@syncraft-labs/core`	`0.4.1`	`>= 0.4.2`, `<= 0.4.0`	Deprecated & Revoked
`@syncraft-labs/react`	`0.4.1`	`>= 0.4.2`, `<= 0.4.0`	Deprecated & Revoked
`@syncraft-labs/vue`	`0.4.1`	`>= 0.4.2`, `<= 0.4.0`	Deprecated & Revoked

Threat Context & Attack Vector

The incident originated from a social engineering scheme widely attributed by cybersecurity researchers to the PolinRider / Contagious Interview threat campaign:

Initial Access via Social Engineering: The maintainer was targeted under the guise of an external technical freelance assessment, leading to the execution of a malicious test workspace in a local development environment.
Credential Extraction: A background InfoStealer / Remote Access Trojan (RAT) payload extracted developer credentials stored on the machine, including a GitHub Personal Access Token (PAT) and active NPM publishing credentials.
Unauthorized Release: Using these exfiltrated tokens, the threat actor triggered an automated build and published version 0.4.1 of all three packages to the NPM registry.

Technical Payload Analysis

The payload injected into dist/index.js of version 0.4.1 featured the following behavior:

Whitespace Padding Evasion: The malicious JavaScript code was placed at the bottom of the file separated by hundreds of empty lines (whitespace padding), designed to evade quick terminal file viewing, code diffing, and standard static review.
Credential & Secret Harvesting: The code inspected environment variables (process.env) looking for API keys, cloud provider secrets (AWS, GCP, Azure), database connection strings, and .env configurations.
Host Enumeration: The payload attempted to locate SSH private keys, git configuration tokens, and browser extension storage (targeting developer accounts and crypto wallet extensions).
Command & Control (C2): Harvested metadata was packaged for exfiltration via outbound HTTP requests to remote attacker-controlled infrastructure.

Incident Response Timeline (August 22, 2026)

[T+0:00] External security report received regarding anomalies in v0.4.1
   │
[T+0:45] Malicious code verified in dist artifacts ──► Immediate 'npm deprecate' on all 3 packages
   │
[T+1:30] Full revocation of GitHub PATs, NPM publishing tokens, SSH keys, and API secrets
   │
[T+2:30] Machine isolation, drive wipe, clean OS reinstall & deep forensic audit
   │
[T+4:00] Rebuilt from verified Git source in isolated cleanroom ──► Published clean v0.4.2
   │
[T+5:00] Official security advisories published & registry alerts submitted

Remediation Guide for Users & CI/CD Pipelines

If your repository, application, or build pipeline resolved to version 0.4.1:

1. Upgrade to v0.4.2 or Higher

Update your dependency declarations in package.json to explicitly use 0.4.2 or later:

# npm
npm install @syncraft-labs/core@latest @syncraft-labs/react@latest @syncraft-labs/vue@latest

# pnpm
pnpm update @syncraft-labs/core @syncraft-labs/react @syncraft-labs/vue

# yarn
yarn upgrade @syncraft-labs/core @syncraft-labs/react @syncraft-labs/vue

2. Purge Lockfiles and Package Caches

# Clear NPM cache
npm cache clean --force

# Remove node_modules and lockfile, then reinstall
rm -rf node_modules package-lock.json
npm install

3. Rotate All Sensitive Secrets

If version 0.4.1 was executed in a development workstation or CI/CD runner:

Rotate all environment secrets (.env files, API keys, database credentials, third-party service tokens) present during execution.
Rotate cloud provider credentials (AWS Access Keys, GCP Service Account keys, Azure credentials).
Rotate SSH keys, Git tokens, and NPM tokens.
Inspect system startup scripts (~/.bashrc, ~/.zshrc, ~/.profile) for suspicious appended commands.

Permanent Preventative Hardening

Syncraft Labs has instituted the following structural security controls to protect all future releases:

Mandatory 2FA / WebAuthn Enforcement: Multi-factor authentication with hardware security keys is strictly enforced on all NPM accounts with publish rights.
CI/CD Trusted Publishing via OIDC: Transitioned release workflows to short-lived OpenID Connect (OIDC) tokens with verifiable NPM build provenance attestations, eliminating long-lived personal publish tokens.
Automated Artifact Diffing: Continuous integration pipelines now perform binary and abstract syntax tree (AST) comparisons between compiled TypeScript outputs and source trees prior to packaging.
Isolated Sandboxing: All third-party evaluations, external contributions, and untrusted workspaces are strictly quarantined within disposable, non-networked containers.

Inquiries & Contact

For any questions, security concerns, or additional verification regarding this advisory, please contact:

Email: denislistiadi24@gmail.com
GitHub Security: Submit Private Advisory