@viby/sdk@0.3.11
Framework-agnostic SDK for building persistent, skill-guided vibe coding products.
AI Security Review
scanned 3d ago · by lpm-firewall-aiThe remote skills feature sends a Vercel OIDC credential to skills.sh without a separate consent step. This is a concrete cross-service credential transfer, even though it occurs only during configured remote skill resolution.
Static reason
No blocking static signals were detected.; previous stored version diff introduced dangerous source
Trigger
A generation resolves a configured string skill while `VERCEL_OIDC_TOKEN` is set.
Impact
The external service receives a Vercel-issued identity token, which may disclose deployment identity or grant access within its token audience.
Mechanism
The resolver reads the environment token and sends it as a Bearer header to the skills.sh API.
Attack narrative
When generation resolves a configured remote skill, the SDK checks for `VERCEL_OIDC_TOKEN` and sends it as a Bearer credential to skills.sh. The token belongs to Vercel’s identity system, and the source provides no consent step for sharing it with that service. The same lookup can fall back to GitHub, but that does not prevent the token transfer when it is present.
AI rationale
The remote skills feature sends a Vercel OIDC credential to skills.sh without a separate consent step. This is a concrete cross-service credential transfer, even though it occurs only during configured remote skill resolution.
Evidence
dist/skills.jsdist/client.js
Network endpoints1
skills.sh
Decision evidence
public snapshotAI called this Malicious at 91.0% confidence as Malware with low false-positive risk.
Evidence for block
- Remote skill resolution reads `VERCEL_OIDC_TOKEN` and passes it to the skills.sh resolver.
- The resolver sends that token as a Bearer credential to `https://skills.sh/api/v1/skills/${id}`.
- A string skill reference invokes remote resolution.
- Generation calls the resolver when skills have not already been attached.
Evidence against
- The token is sent only when a configured string skill is resolved during generation and `VERCEL_OIDC_TOKEN` is present.
- Remote skills are an advertised SDK feature; the GitHub fallback sends `GITHUB_TOKEN` to GitHub’s own API.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStringsMinifiedUrlStrings
Source & flagged code
5 flaggeddist/integration-vercel.jsView file
2import { ConfigurationError } from "./errors.js";
L3: const DEFAULT_API_URL = "https://api.vercel.com";
L4: const DEFAULT_WEB_URL = "https://vercel.com";
...
L9: const textEncoder = new TextEncoder();
L10: const textDecoder = new TextDecoder(undefined, { fatal: true });
L11: export class VercelDeploymentError extends Error {
...
L46: },
L47: body: new URLSearchParams({ token: current.accessToken }),
L48: signal: context.signal,
Low
Weak Crypto
Package source references weak cryptographic algorithms.
dist/integration-vercel.jsView on unpkg · L2dist/skills.jsView file
13backend: ["backend", "api", "server", "authentication", "session", "webhook"],
L14: data: ["database", "schema", "query", "postgres", "migration", "storage"],
L15: ai: ["ai", "agent", "model", "llm", "prompt", "embedding", "generation"],
...
L32: #cache = new Map();
L33: constructor(groups = {}, rootDirectory = process.cwd(), resolvers = []) {
L34: this.#groups = groups;
...
L69: for (const resolver of this.#resolvers) {
L70: const output = await resolver.resolve({ reference, category, prompt });
L71: if (output)
...
L235: async function resolveRemoteSkill(id) {
L236: const oidcToken = process.env.VERCEL_OIDC_TOKEN;
L237: if (oidcToken) {
High
Credential Exfiltration
Findings
1 Critical3 High3 Medium6 Low
CriticalPrevious Version Dangerous Deltadist/api-host.js
HighCredential Exfiltrationdist/skills.js
HighTrigger Reachable Credential Exfiltrationdist/skills.js
HighSemantic Analysis Limiteddist/deployment-preparation.js#virtual:normalized:round1
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowNon Install Lifecycle Scripts
LowScripts Present
LowWeak Cryptodist/integration-vercel.js
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to @viby/sdk@0.3.11.
See all versions of @viby/sdk for other recorded verdicts.
- Avoid installing @viby/sdk@0.3.11. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.