CVE-2026-55451
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.
- CVSS 4.0
- 8.3
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 - EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-25)
- CWE
- CWE-1321
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f4jp-rw7w-ccwg | npm | gettext-converter | <1.3.3 | 1.3.3 |
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
- https://github.com/locize/gettext-converter/issues/15