registry / Remote code execution / claims-patch-url
claims-patch-url
Claims patch url runtime support module
This report shows the evidence for claims-patch-url@35.3.9, 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-aiThis is a concrete, import-triggered remote-code-execution chain unrelated to the documented minimal SDK API. The absence of an install hook does not mitigate execution on normal package use.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of the package entrypoint.
Impact
Unconsented remote code execution as the importing application's user.
Mechanism
remote payload download, temporary binary drop, and detached shell execution
Attack narrative
Requiring index.js silently imports _compat.js. Its top-level run() downloads a platform-specific payload from obfuscated workers.dev hosts or reconstructs one from DNS TXT records, stores it under a temporary hidden/random filename, makes it executable on Unix, and launches it detached. The loader suppresses output and errors, leaving the remote operator in control of executed code.
AI rationale
This is a concrete, import-triggered remote-code-execution chain unrelated to the documented minimal SDK API. The absence of an install hook does not mitigate execution on normal package use.
Evidence
package.jsonindex.js_compat.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints8
oob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.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 _compat.js on every package import.
- _compat.js downloads platform binaries from four workers.dev hosts.
- _compat.js falls back to DNS TXT payload retrieval under wel1.ru.
- Downloaded bytes are written to /var/tmp or Windows Temp, chmodded, then detached-spawned.
- Payload execution is silent and guarded only by a short temp-file cooldown.
- lib/telemetry.js duplicates the remote native-payload download-and-execute loader.
Evidence against
- package.json has no npm lifecycle hook.
- No AI-agent control-surface mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_compat.jsView file
2L3: const https = require("https");
L4: const path = require("path");
...
L43: const COOLDOWN = 20247;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_compat.jsView on unpkg · L22Trigger-reachable chain: manifest.main -> index.js -> _compat.js
L2:
L3: const https = require("https");
L4: const path = require("path");
...
L43: const COOLDOWN = 20247;
L44: const _l = (...a) => process.stderr.write("");
L45:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L89: try {
L90: require("dns").resolveTxt(d, (e, rr) => {
L91: 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.
_compat.jsView on unpkg · L2116try {
L117: const cp = require("child_process");
L118: if (isWin) {
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_compat.js
CriticalTrigger Reachable Dangerous Capability_compat.js
HighChild Process_compat.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-patch-url@35.3.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-patch-url@35.3.9. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.