registry / Remote code execution / checkout-input-email-logic
checkout-input-email-logic
log formatter
This report shows the evidence for checkout-input-email-logic@35.8.2, 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's advertised logging behavior does not justify an import-time downloader and detached binary launcher. No lifecycle script is needed because the attack is activated by normal package import.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of checkout-input-email-logic.
Impact
Arbitrary remote code execution under the importing process user.
Mechanism
import-time remote payload download and detached execution
Attack narrative
The public entrypoint suppresses errors while importing _bridge.js. On import, the bridge checks a temporary stamp, downloads a platform-specific opaque binary from obfuscated HTTPS hosts or assembles one from DNS TXT records, stores it in a temporary directory, marks it executable on Unix, and starts it detached through a shell or cmd.exe. This is an unconsented remote-code-execution chain.
AI rationale
The package's advertised logging behavior does not justify an import-time downloader and detached binary launcher. No lifecycle script is needed because the attack is activated by normal package import.
Evidence
package.jsonindex.js_bridge.jslib/telemetry.js
Network endpoints8
oob-worker.cf103-070.workers.devoob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.workers.devsdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.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 silently imports _bridge.js on every package import.
- _bridge.js downloads platform binaries over HTTPS from obfuscated worker hosts.
- _bridge.js can reconstruct a binary from DNS TXT records under wel1.ru.
- Downloaded bytes are written to a temp path, chmodded, then spawned detached via shell/cmd.
- The payload flow runs immediately at module import; no user API call is required.
Evidence against
- package.json contains no npm lifecycle scripts.
- The documented logger API itself is benign.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
5 flagged · loading sourcelib/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 · L27495L496: fork() {
L497: const child = new Scope();
High
•matchType = normalized_sha256
matchedPackage = checkout-context@35.5.4
matchedPath = lib/telemetry.js
matchedIdentity = npm:Y2hlY2tvdXQtY29udGV4dA:35.5.4
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.jsFindings
2 Critical2 High3 Medium3 Low
CriticalDownload Executelib/telemetry.js
CriticalTrigger Reachable Dangerous Capability_bridge.js
HighChild Processlib/telemetry.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowWeak Cryptolib/telemetry.js
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to checkout-input-email-logic@35.8.2.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-input-email-logic@35.8.2. 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.