CVE-2026-55451
HighCVSS 8.3Exploitation Probability (EPSS)
Low risk45th percentile - higher than 45% of all known CVEs
Summary
gettext-converter before version 1.3.3 in js2i18next() uses dynamic object keys without rejecting __proto__, constructor, or prototype. Converting untrusted translation data can lead to prototype pollution affecting the entire process.
Risk Assessment
Prototype pollution can cause denial of service and may enable application-dependent follow-on attacks, such as object manipulation.
Recommendation
Upgrade gettext-converter to version 1.3.3 or later and validate translation data before conversion.
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Original NVD description (English source)
gettext-converter provides gettext resource conversion utilities for JavaScript. Prior to 1.3.3, js2i18next() in lib/js2i18next.js splits nested translation keys using options.keyseparator, whose default value consists of two number signs, and uses each segment as a dynamic object key without rejecting __proto__, constructor, or prototype. When an application converts untrusted PO or i18next translation data, a __proto__ segment resolves Object.prototype as the nested write target and Object.assign writes attacker-controlled translated properties onto the process-wide prototype. The resulting prototype pollution can cause denial of service and may enable application-dependent follow-on attacks. This issue is fixed in version 1.3.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

