Which versions of therdweb are malicious?

The following npm versions of therdweb are flagged malicious: 0.0.8. Treat any of these as compromised.

How do I remediate therdweb if I installed it?

therdweb is a typosquat — you almost certainly intended a legitimately-named package. Remove therdweb, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

I already installed therdweb — how do I know if it already compromised me?

If therdweb was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is therdweb part of a known attack campaign?

Yes — therdweb is associated with the IN-MAL-2026-007357, GHSA-g2vx-7x66-f2wv campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find therdweb across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for therdweb (version 0.0.8). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging therdweb across your stack and pipelines.

Malicious package

therdwebnpm

therdweb is a confirmed malicious npm package (MAL-2026-6342) that typosquats a legitimate package to trick installs (malicious version 0.0.8). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in therdweb (npm)

MAL-2026-6342

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall therdweb

What this malware does

The package's name 'therdweb' is a one-character variation of the popular 'thirdweb' SDK, while its contents (README, source code, author field 'Michael Mclaughlin', repository URL pointing at MikeMcl/big.js, version banner '7.0.1') are copied verbatim from the unrelated big.js library — the publisher is not the original author of either project. Both shipped entrypoints, big.js and big.mjs, contain an injected try/catch block that performs require("parket-slot") and immediately invokes doc.from_str() on it at module load, with the catch block left empty to swallow errors. parket-slot is not listed in package.json dependencies and is not mentioned in the README (which falsely claims 'No dependencies'); package.json additionally declares an undocumented dependency log-taker@^0.0.9. Any consumer that imports or requires this package will execute code from these external, undeclared/hidden modules controlled by the same actor, while the README hides their existence. This is the loader half of a multi-package install-graph dropper paired with name-confusion against thirdweb and identity impersonation of big.js.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

1 flagged

0.0.8

Indicators of compromise (SHA-256)

d9e63765322daedaf6d802d322402a1837d3ec653ecf47909d243e5c87398117

3a71ff401b8ca3f61c6dcb8b5ea46adbda1fc6eb03e773757cadae905c02dce8

Detection & response playbook

Typosquat

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for therdweb (version 0.0.8). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging therdweb across your stack and pipelines.
If you installed it — respond
therdweb is a typosquat — you almost certainly intended a legitimately-named package. Remove therdweb, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If therdweb was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks therdweb before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. therdweb on npm has been identified as a malicious package (version 0.0.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-007357GHSA-g2vx-7x66-f2wv

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks therdweb-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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