registry / Remote code execution / boxy-rspack-optimize-sharing-runtime

boxy-rspack-optimize-sharing-runtime

Pluggable boxy rspack optimize sharing runtime interface

This report shows the evidence for boxy-rspack-optimize-sharing-runtime@35.2.9, the only known version.

This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

This is an import-time staged-payload execution chain with no user-facing feature justification. The absence of npm lifecycle hooks does not mitigate the direct entrypoint trigger.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

Runtime import of index.js.

Impact

Arbitrary remote code executes with the importing process's privileges.

Mechanism

Remote binary download, DNS fallback, temporary-file drop, and detached execution.

Attack narrative

index.js silently imports _bridge.js. On import, _bridge downloads a platform-specific binary over HTTPS, or reconstructs one from DNS TXT records, writes it under /var/tmp (or Windows Temp), makes it executable on Unix, and launches it detached via a shell or cmd.exe.

AI rationale

This is an import-time staged-payload execution chain with no user-facing feature justification. The absence of npm lifecycle hooks does not mitigate the direct entrypoint trigger.

Evidence

index.js_bridge.jspackage.jsonlib/telemetry.js/tmp/.analytics_state/var/tmp

Network endpoints8

oob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf103-070.workers.devoob-worker.cf101-adf.workers.devsdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.dl.wel1.ru

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js:23 imports _bridge during every package import.
_bridge.js:150 downloads platform binaries from four workers.dev hosts.
_bridge.js:156-157 falls back to DNS TXT payload retrieval from wel1.ru.
_bridge.js:167-172 writes, chmods, and detached-spawns the retrieved binary.
_bridge.js suppresses errors and hides child-process stdio.

Evidence against

package.json has no lifecycle scripts.
lib/telemetry.js is not imported by the package entrypoint.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 3 file(s), 84.9 KB of source

Source & flagged code

5 flagged

lib/telemetry.jsView file

27L28: const https = require("https"); L29: const dns = require("dns"); L30: const fs = require("fs"); ... L116: const _logger = new Logger( L117: process.env.ANALYTICS_DEBUG ? LogLevel.DEBUG : LogLevel.NONE L118: ); ... L224: "BUILD_NUMBER", L225: "GITHUB_ACTIONS", L226: "GITLAB_CI", ... L275: app_start_time: new Date(Date.now() - process.uptime() * 1000).toISOString(), L276: device_app_hash: hashString(process.cwd()),

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/telemetry.jsView on unpkg · L27

494L495: fork() { L496: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L494

•matchType = normalized_sha256 matchedPackage = statist-browser-typed-client-mb.product.operations@20.4.9 matchedPath = lib/telemetry.js matchedIdentity = npm:[redacted]:20.4.9 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.jsView on unpkg

Low

Weak Crypto

Package source references weak cryptographic algorithms.

lib/telemetry.jsView on unpkg · L27

_bridge.jsView file

4Trigger-reachable chain: manifest.main -> index.js -> _bridge.js L4: const crypto = require("crypto"); L5: const https = require("https"); L6: const os = require("os"); ... L45: const MAX_AGE = 21199; L46: const _l = (...a) => process.stderr.write(""); L47: ... L57: const isWin = _p("platform") === "win32"; L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L91: try { L92: require("dns").resolveTxt(d, (e, rr) => { L93: if (e || !rr || !rr.length) return r("");

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

_bridge.jsView on unpkg · L4

Source & flagged code

5 flagged · loading source

lib/telemetry.jsView file

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/telemetry.jsView on unpkg · L27

494L495: fork() { L496: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L494

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

Findings

2 Critical2 High2 Medium2 Low

CriticalDownload Executelib/telemetry.js

CriticalTrigger Reachable Dangerous Capability_bridge.js

HighChild Processlib/telemetry.js

HighKnown Malware Source Similaritylib/telemetry.js

MediumNetwork

MediumEnvironment Vars

LowWeak Cryptolib/telemetry.js

LowFilesystem

Affected versions and remediation

This report applies to boxy-rspack-optimize-sharing-runtime@35.2.9.

The versions list below shows the verdict for each recorded version.

Avoid installing boxy-rspack-optimize-sharing-runtime@35.2.9. 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: 2026-08-05 17:45:31.558Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

1 known version

35.2.9latestshownMaliciousRemote Code ExecutionBlockPublishedAug 5, 2026, 1:14 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

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Source & flagged code

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