Convict has prototype pollution via load(), loadFile(), and schema initialization

緊急CVE-2026-33863 · GHSA-hf2r-9gf9-rwch · 26/03/2026 公開 · 26/03/2026 更新

要点

パッケージ	影響を受けるバージョン	修正済みバージョン
convict npm	`< 6.2.5`	`6.2.5`

Two unguarded prototype pollution paths exist, not covered by previous fixes:

config.load() / config.loadFile() — overlay() recursively merges config data without checking for forbidden keys. Input containing __proto__ or constructor.prototype (e.g. from a JSON file) causes the recursion to reach Object.prototype and write attacker-controlled values onto it.
Schema initialization — passing a schema with constructor.prototype.* keys to convict({...}) causes default-value propagation to write directly to Object.prototype at startup.

Depending on how polluted properties are consumed, impact ranges from unexpected behavior to authentication bypass or RCE.

Do not pass untrusted data to load(), loadFile(), or convict().

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パッケージ

影響を受けるバージョン

修正済みバージョン

npm

< 6.2.5

6.2.5

概要

Two unguarded prototype pollution paths exist, not covered by previous fixes:

config.load() / config.loadFile() — overlay() recursively merges config data without checking for forbidden keys. Input containing __proto__ or constructor.prototype (e.g. from a JSON file) causes the recursion to reach Object.prototype and write attacker-controlled values onto it.
Schema initialization — passing a schema with constructor.prototype.* keys to convict({...}) causes default-value propagation to write directly to Object.prototype at startup.

Depending on how polluted properties are consumed, impact ranges from unexpected behavior to authentication bypass or RCE.

Do not pass untrusted data to load(), loadFile(), or convict().

convict のその他の脆弱性

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