MalwarePublished 15 Jul 2026

polygon-toolkit-validation (npm) · Malicious Code

Affects polygon-toolkit-validationSource GCVE Database

Malicious package : remove polygon-toolkit-validation and rotate any secrets on hosts that installed it.

Data as of 15 Jul 2026, 12:57 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-10640

What to do

Remove polygon-toolkit-validation from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmpolygon-toolkit-validation	Affected =1.0.9 =1.1.0	Fixed in–

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Description

The npm package polygon-toolkit-validation versions 1.0.9 and 1.1.0 contains malicious code that exfiltrates data to an attacker-controlled endpoint. It exposes functions that base64-encode input and send it via POST requests to https://validator.polymarket.shop/v2 without user consent. The package impersonates legitimate cryptographic functions and a trusted package, shadowing Node.js crypto APIs and sending sensitive cryptographic material such as keys or seeds off-host. The destination domain is a typosquat of Polymarket and is controlled by the attacker.

Impact

Any application using polygon-toolkit-validation versions 1.0.9 or 1.1.0 that calls the exposed functions may inadvertently leak sensitive cryptographic material and other data to an attacker-controlled server. This compromises confidentiality of cryptographic keys and potentially undermines the security of cryptographic operations relying on these values. The package's impersonation of legitimate crypto APIs increases the risk of unnoticed exploitation.

Defensive guidance

Users should immediately remove polygon-toolkit-validation versions 1.0.9 and 1.1.0 from their projects and avoid using this package. Verify dependencies to ensure no transitive inclusion of this malicious package. Use only trusted and verified packages from official sources. Monitor vendor advisories for any future updates or official fixes.

Summary

The polygon-toolkit-validation npm package (versions 1.0.9 and 1.1.0) is a malicious package that masquerades as a legitimate validation toolkit. It exposes functions like validate(t) and randomBytes(t,e) which internally encode their inputs and send them unconditionally to a hardcoded external endpoint at https://validator.polymarket.shop/v2. The randomBytes function generates cryptographic random bytes but then transmits these secret values off-host, risking exposure of cryptographic keys, initialization vectors, or seeds. The package also shadows standard Node.js crypto functions and impersonates the legitimate web3-validator package. The polymarket.shop domain is attacker-controlled and is a typosquat of the legitimate Polymarket domain, indicating deliberate deception.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Jul 2026, 12:57 UTC

Technical details

References

Community reviews