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.
Published: 2026-09-14
Score: 8.3 High
EPSS: n/a
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-f4jp-rw7w-ccwg gettext-converter: Prototype pollution in js2i18next() via crafted translation keys
History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title gettext-converter: Prototype pollution in js2i18next() via crafted translation keys
Weaknesses CWE-1321
References
Metrics cvssV4_0

{'score': 8.3, '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'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-14T18:53:39.960Z

Reserved: 2026-06-16T21:59:57.018Z

Link: CVE-2026-55451

cve-icon Vulnrichment

Updated: 2026-09-14T18:53:15.089Z

cve-icon NVD

Status : Received

Published: 2026-09-14T17:17:48.383

Modified: 2026-09-14T19:17:32.213

Link: CVE-2026-55451

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses