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CVE-2026-55451 is a prototype pollution vulnerability in the js2i18next() function of gettext-converter. The flaw arises when crafted translation keys are processed as dynamic object paths without rejecting dangerous key segments such as proto, constructor, or prototype. By supplying malicious translation data, an attacker can modify Object.prototype and thereby influence object behavior across the JavaScript runtime. This can destabilize application logic and create conditions for broader security impact depending on how polluted properties are later consumed.
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