{"id":"EUVD-2026-77634","revision":null,"records":[{"revision":"1fb0bd7acb364ae3a429ac53494ef5f2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55451","aliases":[],"title":"gettext-converter: Prototype pollution in js2i18next() via crafted translation keys","description":"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.","state":0,"publishedAt":"2026-09-14T16:49:36.238+00:00","modifiedAt":"2026-09-14T18:53:39.96+00:00","affected":[{"ecosystem":"Vendor product","name":"gettext-converter","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"locize\",\n                    \"product\": \"gettext-converter\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.3.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.3,"severity":"HIGH"}],"references":["https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg","https://github.com/locize/gettext-converter/issues/15","https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31","https://github.com/locize/gettext-converter/releases/tag/v1.3.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55451","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55451","identifiers":["CVE-2026-55451"]},"retained":false,"historicalAffected":[]},{"revision":"45422dbe75cf4a029460331717a5f85e","observedAt":"2026-11-11T17:11:02.778+00:00","statement":{"source":"euvd","id":"EUVD-2026-77634","aliases":["CVE-2026-55451","GHSA-f4jp-rw7w-ccwg"],"title":"gettext-converter provides gettext resource conversion utilities for JavaScript. 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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.","state":0,"publishedAt":"2026-09-14T17:17:48.383+00:00","modifiedAt":"2026-09-30T19:57:08.043+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.3,"severity":"HIGH"}],"references":["https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31","https://github.com/locize/gettext-converter/issues/15","https://github.com/locize/gettext-converter/releases/tag/v1.3.3","https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55451","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-09-14T17:17:48.383","lastModified":"2026-09-30T19:57:08.043"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55451","identifiers":["CVE-2026-55451"]},"retained":false,"historicalAffected":[]},{"revision":"45d18bb05f0945d280792face2890bcb","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-f4jp-rw7w-ccwg","aliases":["CVE-2026-55451"],"title":"gettext-converter: Prototype pollution in js2i18next() via crafted translation keys","description":"### Impact\n\n`js2i18next()` is vulnerable to prototype pollution. When converting translations, it splits nested keys on the key separator (default `##`) and uses each segment as a dynamic object key while building the output object. A key whose segment is `__proto__` (e.g. `__proto__##gcPolluted`) causes the converter to resolve `Object.prototype` as the nested write target and assign the translated value onto it, polluting `Object.prototype` for the whole runtime.\n\nAny application that converts translation data (PO / i18next JS objects) originating from an untrusted or user-controlled source is affected. Prototype pollution can lead to denial of service and, depending on the surrounding application, may enable further attacks.\n\n### Patches\n\nFixed in `gettext-converter@1.3.3`. Key segments equal to `__proto__`, `constructor`, or `prototype` are now rejected before being used as dynamic object keys.\n\n### Workarounds\n\nUpgrade to `1.3.3`. If upgrading is not immediately possible, sanitize/validate translation keys before passing them to `js2i18next()` and reject any key whose `##`-separated segments include `__proto__`, `constructor`, or `prototype`.","state":0,"publishedAt":"2026-08-20T20:11:13+00:00","modifiedAt":"2026-08-20T20:26:04.313226+00:00","affected":[{"ecosystem":"npm","name":"gettext-converter","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.3.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg","https://github.com/locize/gettext-converter/issues/15","https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31","https://github.com/locize/gettext-converter","https://github.com/locize/gettext-converter/releases/tag/v1.3.3"],"sourceUrl":"https://github.com/advisories/GHSA-f4jp-rw7w-ccwg","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-f4jp-rw7w-ccwg","identifiers":["GHSA-f4jp-rw7w-ccwg","CVE-2026-55451"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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