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Malicious package

json-to-table-utilnpm

Advisory published Updated

json-to-table-util is a confirmed malicious npm package (MAL-2026-11119) that executes malicious code on install (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in json-to-table-util (npm)

MAL-2026-11119
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall json-to-table-util

What this malware does

postinstall.js runs automatically on npm install and executes a shell pipeline via child_process.exec that collects hostname, user, working directory, uname, container/cgroup indicators, process tree, network info (/etc/resolv.conf, IPs), GitHub Actions CI variables (GITHUB_REPOSITORY, GITHUB_ACTOR, GITHUB_RUN_ID, RUNNER_NAME), and the entire process environment via env (filtering only npm_* noise). It also probes AWS IMDS at 169.254.169.254 and Tencent Cloud metadata at metadata.tencentyun.com to fingerprint cloud infrastructure. The aggregated output is base64-encoded and sent over plain HTTP via curl GET to the hardcoded Burp Collaborator subdomain pzs5w7ntzhsnepwk564lyfdci3oucl0a.oastify.com/z?d=<base64>. On CI runners this captures any secrets exported to the environment (cloud keys, GITHUB_TOKEN, tokens injected into the job).

The OpenSSF Package Analysis project identified 'json-to-table-util' @ 1.0.0 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.

  • The package executes one or more commands associated with malicious behavior.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

63ee08885a126855fbc96dbbb6f8c4ef903d9dc8f2cb02fe0fa178a7db1ed904
2317bf7f973ca611fdd2215509ae94c302f868ae9fb5c5f00de0b6bd13fe3bc4

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for json-to-table-util (version 1.0.0).

  2. If you installed it — respond

    Remove json-to-table-util from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If json-to-table-util was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. json-to-table-util on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-011011

References

Credits

  • Amazon Inspector · finder
  • OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks json-to-table-util-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

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json-to-table-util (npm) malicious package — MAL-2026-11119 | O3 Security