registry / resend-cli / 2.26.1
resend-cli@2.26.1
The official CLI for Resend
AI Security Review
scanned 8d ago · by lpm-firewall-aiSource inspection found default CLI usage telemetry with an interactive notice and opt-out variables. Its inspected payload is limited to command metadata and flag names, and no malicious behavior was established.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
A parsed CLI command other than update or telemetry.
Impact
The inspected payload contains usage metadata, not saved credentials or email content, so no concrete attack impact was established.
Mechanism
The CLI queues command and environment metadata, including flag names, and sends it to the configured telemetry endpoint; opt-out environment variables suppress this path.
AI rationale
Source inspection found default CLI usage telemetry with an interactive notice and opt-out variables. Its inspected payload is limited to command metadata and flag names, and no malicious behavior was established.
Evidence
dist/cli.cjs
Network endpoints1
us.i.posthog.com/capture/
Decision evidence
public snapshotAI called this Clean at 94.0% confidence as Benign with low false-positive risk.
Evidence for AI clean decision
- package.json exposes dist/cli.cjs as the resend CLI and lists no install lifecycle hook.
- After normal CLI command parsing, the bundle records command metadata; the telemetry payload contains command, CLI version, OS, Node version, interactivity, install method, and flag names.
- Telemetry can be disabled with DO_NOT_TRACK=1 or RESEND_TELEMETRY_DISABLED=1, and the CLI displays a telemetry notice with an opt-out instruction in interactive use.
- The payload is posted to a fixed PostHog endpoint; the inspected data flow does not include saved Resend credentials or email content.
- The required dependency sources expose terminal prompts and Commander CLI functionality; their inspected manifests and entrypoints show no install-time behavior.
Evidence against
- Usage telemetry is enabled by default, and the notice is shown only in interactive use.
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetwork
Source & flagged code
10 flaggeddist/cli.cjsView file
1Source sends the broad process environment to a literal external destination.
L1: #!/usr/bin/env node
L2: "use strict";var Zu=Object.create;var Vi=Object.defineProperty;var ep=Object.getOwnPropertyDescriptor;var tp=Object.getOwnPropertyNames;var op=Object.getPrototypeOf,ip=Object.proto...
L3: `)}displayWidth(t){return yn(t).length}styleTitle(t){return t}styleUsage(t){return t.split(" ").map(o=>o==="[options]"?this.styleOptionText(o):o==="[command]"?this.styleSubcommandT...
...
L13: (Did you mean one of ${i.join(", ")}?)`:i.length===1?`
L14: (Did you mean ${i[0]}?)`:""}Cn.suggestSimilar=mp});var kn=je(mr=>{var up=require("node:events").EventEmitter,sr=require("node:child_process"),lt=require("node:path"),No=require("no...
L15: - specify the name in Command constructor or using .name()`);ret
Critical
Hardcoded Runtime Data Exfiltration
Source sends credentials or rich application records to a package-controlled external receiver enabled by default.
dist/cli.cjsView on unpkg · L113(Did you mean one of ${i.join(", ")}?)`:i.length===1?`
L14: (Did you mean ${i[0]}?)`:""}Cn.suggestSimilar=mp});var kn=je(mr=>{var up=require("node:events").EventEmitter,sr=require("node:child_process"),lt=require("node:path"),No=require("no...
L15: - specify the name in Command constructor or using .name()`);return o=o||{},o.isDefault&&(this._defaultCommandName=t._name),(o.noHelp||o.hidden)&&(t._hidden=!0),this._registerComma...
...
L26: Expecting one of '${i.join("', '")}'`);let r=`${t}Help`;return this.on(r,n=>{let a;typeof o=="function"?a=o({error:n.error,command:n.command}):a=o,a&&n.write(`${a}
L27: `)}),this}_outputHelpIfRequested(t){let o=this._getHelpOption();o&&t.find(r=>o.is(r))&&(this.outputHelp(),this._exit(0,"commander.helpDisplayed","(outputHelp)"))}};function Sn(e){r...
Findings
3 Critical5 High5 Medium5 Low
CriticalHardcoded Runtime Data Exfiltrationdist/cli.cjs
CriticalCommand Output Exfiltrationdist/cli.cjs
CriticalTrigger Reachable Dangerous Capabilitydist/cli.cjs
HighChild Processdist/cli.cjs
HighSame File Env Network Executiondist/cli.cjs
HighSandbox Evasion Gated Capabilitydist/cli.cjs
HighTrigger Reachable Command Output Exfiltrationdist/cli.cjs
HighTrigger Reachable Persistencedist/cli.cjs
MediumDynamic Requiredist/cli.cjs
MediumNetwork
MediumEnvironment Vars
MediumInstall Persistencedist/cli.cjs
Medium
Affected versions and remediation
This report applies to resend-cli@2.26.1.
See all versions of resend-cli for other recorded verdicts.
- Review the evidence and your use of resend-cli@2.26.1 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.