postboi@0.57.0
Postboi is an email provider and TypeScript SDK. Send email with one token and no DNS setup, plus SMS, WhatsApp, push and chat from the same API. You can also use your own provider (Resend, SES, Postmark and more) if you want to.
AI Security Review
scanned 1mo ago · by lpm-firewall-aiThe inspected source supports a warning for package-owned agent extension setup and continuing instruction updates. CLI activation and initial interactive consent limit the behavior, so a malicious publication block is unsupported.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Running postboi init or postboi skill enables setup; postboi sync refreshes an existing skill. The --agent option automatically accepts setup prompts.
Impact
Future package releases can change instructions consumed by coding agents. This warrants a warning under the agent integration policy rather than a malware block.
Mechanism
The CLI writes or links package-owned skills, creates companion agent integration, and appends an instruction pointer. Existing installations serve as the condition for later refresh without renewed confirmation.
AI rationale
The inspected source supports a warning for package-owned agent extension setup and continuing instruction updates. CLI activation and initial interactive consent limit the behavior, so a malicious publication block is unsupported.
Evidence
dist/cli.js.claude/skills/postboi/SKILL.md.agents/skills/postboi/SKILL.mdAGENTS.mdpackage.json
Decision evidence
public snapshotAI called this Suspicious at 94.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- The CLI targets Postboi skills in .claude and .agents and appends a skill pointer to an existing AGENTS.md.
- Initial interactive setup requests confirmation; existing skills refresh without another prompt.
- Skill files link to the installed package, allowing later package upgrades to change agent instructions.
- Explicit init and skill commands activate setup; init --agent automatically accepts confirmation.
- The sync command refreshes existing skills, including when invoked by the consumer project's generated prepare script.
- package.json has no preinstall, install or postinstall hook; its prepare script runs SvelteKit synchronization.
Evidence against
- No concrete malicious attack was established in the inspected behavior.
- Agent integration belongs to Postboi and is activated through CLI setup rather than an automatic registry installation hook.
- Runtime dependencies contain fonts, without a dependency on another Postboi release.
Behavioral surface
ChildProcessCryptoDynamicRequire
Source & flagged code
6 flaggeddist/cli.jsView file
41// src/library/encoding.ts
L42: function base64_decode(value) {
L43: const binary = atob(value);
...
L125: const { pathToFileURL } = await import("node:url");
L126: let dir = process.cwd();
L127: for (;; ) {
...
L270: if (this.#hooks.before?.send) {
L271: return this.#hooks.before.send({
L272: provider: this.provider,
...
L319: async send_request(url, init) {
L320: return fetch(url, init);
L321: }
Critical
Credential Exfiltration
Source appears to send environment or credential material to an external endpoint.
dist/cli.jsView on unpkg · L4141// src/library/encoding.ts
L42: function base64_decode(value) {
L43: const binary = atob(value);
...
L125: const { pathToFileURL } = await import("node:url");
L126: let dir = process.cwd();
L127: for (;; ) {
...
L270: if (this.#hooks.before?.send) {
L271: return this.#hooks.before.send({
L272: provider: this.provider,
...
L319: async send_request(url, init) {
L320: return fetch(url, init);
L321: }
Critical
Browser Credential Phishing
Source appears to collect browser login credentials for exfiltration.
dist/cli.jsView on unpkg · L41791} from "node:fs";
L792: import { spawnSync } from "node:child_process";
L793: import { join as join8, delimiter, dirname as dirname4 } from "node:path";
Findings
2 Critical3 High4 Medium5 Low
CriticalCredential Exfiltrationdist/cli.js
CriticalBrowser Credential Phishingdist/cli.js
HighChild Processdist/cli.js
HighShelldist/cli.js
HighCommand Output Exfiltrationdist/cli.js
MediumDynamic Requiredist/workers_env.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowNon Install Lifecycle Scripts
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to postboi@0.57.0.
See all versions of postboi for other recorded verdicts.
- Review the evidence and your use of postboi@0.57.0 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
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