---
id: CVE-2026-55451
title: >-
  gettext-converter provides gettext resource conversion utilities for
  JavaScript
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 sign…
severity: high
cvss: 8.3
cvssVector: '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'
cwe:
  - CWE-1321
  - CWE-915
vendor: locize
product: gettext-converter
affected:
  - gettext-converter < 1.3.3
patched:
  - gettext-converter 1.3.3
published: '2026-09-14'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:17:32.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55451'
references:
  - url: >-
      https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31
    label: security-advisories@github.com
  - url: 'https://github.com/locize/gettext-converter/issues/15'
    label: security-advisories@github.com
  - url: 'https://github.com/locize/gettext-converter/releases/tag/v1.3.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg
    label: security-advisories@github.com
  - url: 'https://github.com/locize/gettext-converter/issues/15'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-f4jp-rw7w-ccwg'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55451.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-55451'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2533213'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-55451'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55451'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - npm
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T18:53:33.771788Z'
cvssSource: cna
aliases:
  - GHSA-f4jp-rw7w-ccwg
ecosystem: npm
ingestedAt: '2026-08-20T21:01:37.111Z'
epss: 0.00414
epssPercentile: 0.35365
scores:
  cna: 8.3
  vendor: 8.2
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55451)

Affected packages:

- `gettext-converter < 1.3.3`

Patched in:

- `gettext-converter 1.3.3`

Source: https://github.com/advisories/GHSA-f4jp-rw7w-ccwg

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4, Red Hat Openshift Data Foundation 4 · no fix planned: Red Hat OpenShift Container Platform 4, Red Hat Openshift Data Foundation 4 · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55451.json)