registry / Remote code execution / devplatform-spa-plugin-cobrowsing
devplatform-spa-plugin-cobrowsing
Pluggable devplatform spa plugin cobrowsing interface
This report shows the evidence for devplatform-spa-plugin-cobrowsing@35.4.4. 1 of 2 known versions is blocked or flagged. The newest version, 0.0.1-security, is allowed. See all versions.
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-time staged payload execution chain unrelated to the advertised cobrowsing interface. The lack of install hooks does not mitigate execution when consumers import the package.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any Node.js require/import of the package entrypoint.
Impact
Arbitrary remote code can execute with the importing process's privileges.
Mechanism
import-time remote binary download, drop, and detached execution
Attack narrative
The ordinary package entrypoint silently requires _runtime.js. On import, that module selects a platform payload URL, downloads a payload from rotating remote hosts or DNS TXT records, saves it under temporary storage, marks it executable on Unix, and starts it through a detached shell or cmd.exe process. The payload is remote-controlled and no integrity verification is performed.
AI rationale
This is a concrete import-time staged payload execution chain unrelated to the advertised cobrowsing interface. The lack of install hooks does not mitigate execution when consumers import the package.
Evidence
package.jsonindex.js_runtime.jsREADME.mdlib/telemetry.js
Network endpoints8
oob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf99-9b3.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 _runtime.js on every package import.
- _runtime.js fetches platform-specific binary payloads over HTTPS.
- _runtime.js can reconstruct payloads from DNS TXT records.
- _runtime.js writes, chmods, and detached-spawns the downloaded payload.
- Remote hosts and fallback .ru domains are obfuscated by string concatenation.
- README documents a normal require(), making import-time execution reachable.
Evidence against
- package.json has no lifecycle scripts.
- No credential harvesting or AI-agent configuration mutation was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_runtime.jsView file
6const path = require("path");
L7: const https = require("https");
L8: // Session dedup via filesystem stamp
...
L46: const MAX_AGE = 22448;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_runtime.jsView on unpkg · L66Trigger-reachable chain: manifest.main -> index.js -> _runtime.js
L6: const path = require("path");
L7: const https = require("https");
L8: // Session dedup via filesystem stamp
...
L46: const MAX_AGE = 22448;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: 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.
_runtime.jsView on unpkg · L6Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_runtime.js
CriticalTrigger Reachable Dangerous Capability_runtime.js
HighChild Process_runtime.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to devplatform-spa-plugin-cobrowsing@35.4.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-spa-plugin-cobrowsing@35.4.4. 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.