gettext-converter: Prototype pollution in js2i18next() via crafted translation keys
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| locize | gettext-converter | before 1.3.3 | 1.3.3 | Patch available | CNA |
| — | gettext-converter (npm) | before 1.3.3 | 1.3.3 | Patch available | GHSA-f4jp-rw7w-ccwg |
- gettext-converter Vendorlocize Affected before 1.3.3 Fixed in 1.3.3 Patch available CNA
- gettext-converter (npm) Vendor— Affected before 1.3.3 Fixed in 1.3.3 Patch available GHSA-f4jp-rw7w-ccwg
Remediation
- Fix · CNA gettext-converter (locize) Fixed in 1.3.3
- Fix · GHSA-f4jp-rw7w-ccwg gettext-converter (npm) Fixed in 1.3.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet |
Not affected: 3 products
- OpenShift Pipelines
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55451
- 2026-10-03 Alias added: GHSA-f4jp-rw7w-ccwg
- 2026-10-21 Affected versions changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
References
Other 5
- 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
- https://github.com/locize/gettext-converter
More locize vulnerabilities
- TI-2026-30289 locize Client SDK: Cross-origin DOM XSS & Handler Hijack Through Missing e.origin Validation in InContext Editor CVSS 3.1HIGH 7.5
- TI-2026-30288 Path traversal / URL injection via unsanitised lng/ns/projectId/version in i18next-locize-backend CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-55451 · CVE Program
- CVE-2026-55451 · NVD
- FIRST EPSS
- GHSA-f4jp-rw7w-ccwg · GitHub Advisory Database · CC BY 4.0
- CVE-2026-55451 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences