# MAL-2026-12753: Malicious code in devplatform-snarkdown (npm)


- **Type:** Malicious package
- **Package:** `devplatform-snarkdown` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12753?

MAL-2026-12753 is a malicious package in devplatform-snarkdown, published on 5 Aug 2026. 

### Official description

On require of the package, _shim.js selects a platform-specific URL, downloads a binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), and falls back to a DNS-TXT covert channel that reconstructs a base64 payload from chunked TXT records under wel1.ru subdomains (sdk/ext/pkg/net.dl.wel1.ru). The fetched bytes are written to a temp path under a masquerading name (e.g..cache_* / dotnet_diag_*.exe), chmodded 0755 on POSIX, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and resolver domains are assembled at runtime by joining string fragments to defeat static analysis. A timestamped lockfile at /tmp/.analytics_state (or %TEMP%\analytics_state) gates re-execution for ~21201 seconds, and DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env vars cause early return — a sandbox/CI evasion posture wrapped in telemetry cover-story naming. The package advertises itself as a markdown parser; downloading and executing a native binary at require time is unrelated to that purpose.

## What should I do about MAL-2026-12753?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12753 is a malicious package: devplatform-snarkdown (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-12753/ (Markdown: https://insights.sbomify.com/MAL-2026-12753/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12753

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12753/
Summaries are generated and may contain mistakes; the official description above is the record.