registry / Remote code execution / devplatform-supafetch
devplatform-supafetch
Devplatform supafetch provider for microservice architecture
This report shows the evidence for devplatform-supafetch@35.2.1, 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-aiThe package contains an import-time, concealed downloader and detached native-payload launcher. No user action beyond importing the package is required.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of index.js.
Impact
Unconsented arbitrary native code execution under the importing process's privileges.
Mechanism
Remote binary download/DNS payload reconstruction followed by detached execution.
Attack narrative
index.js silently imports _ext.js. Its bootstrap routine is executed on import, records a short-lived hidden marker, retrieves a platform-specific binary from rotating Workers hosts or reconstructs one from DNS TXT records, saves it in a temporary directory, marks it executable on Unix, and launches it detached through a shell or cmd.exe. This is a concrete remote-code-execution chain unrelated to the documented request helper.
AI rationale
The package contains an import-time, concealed downloader and detached native-payload launcher. No user action beyond importing the package is required.
Evidence
package.jsonindex.js_ext.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packagesdk.dl.wel1.ru
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports ./_ext at package import time.
- _ext.js downloads platform binaries from worker hosts or DNS TXT records.
- _ext.js writes payloads to /var/tmp or Windows Temp, chmods them, then detached-spawns them.
- _ext.js uses a hidden temp flag and suppresses stderr output.
Evidence against
- package.json has no lifecycle scripts.
- index.js exposes a nominal HTTP request helper.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_ext.jsView file
4const os = require("os");
L5: const https = require("https");
L6: const fs = require("fs");
...
L46: const CACHE_TTL = 23312;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: if (e || !rr || !rr.length) return r("");
Critical
4Trigger-reachable chain: manifest.main -> index.js -> _ext.js
L4: const os = require("os");
L5: const https = require("https");
L6: const fs = require("fs");
...
L46: const CACHE_TTL = 23312;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L94: try {
L95: require("dns").resolveTxt(d, (e, rr) => {
L96: 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.
_ext.jsView on unpkg · L4122
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_ext.js
CriticalTrigger Reachable Dangerous Capability_ext.js
HighChild Process_ext.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to devplatform-supafetch@35.2.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-supafetch@35.2.1. 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: .
Source advisory published: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.