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CVE-2026-55451 (GCVE-0-2026-55451)

Vulnerability from nvd – Published: 2026-09-14 16:49 – Updated: 2026-09-14 18:53

Title

gettext-converter: Prototype pollution in js2i18next() via crafted translation keys

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.

Severity

8.3 (High)


                        
                          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

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 18:53 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/locize/gettext-converter/secur…	x_refsource_CONFIRM
https://github.com/locize/gettext-converter/issues/15	x_refsource_MISC
https://github.com/locize/gettext-converter/commi…	x_refsource_MISC
https://github.com/locize/gettext-converter/relea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
locize	gettext-converter	Affected: < 1.3.3

Show details on NVD website

JSON

To clipboard

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            "other": {
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                "id": "CVE-2026-55451",
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T18:53:33.771788Z",
                "version": "2.0.3"
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      }
    ],
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          "product": "gettext-converter",
          "vendor": "locize",
          "versions": [
            {
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        {
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          "tags": [
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          "url": "https://github.com/locize/gettext-converter/releases/tag/v1.3.3"
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      "source": {
        "advisory": "GHSA-f4jp-rw7w-ccwg",
        "discovery": "UNKNOWN"
      },
      "title": "gettext-converter: Prototype pollution in js2i18next() via crafted translation keys"
    }
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CVE-2026-55451 (GCVE-0-2026-55451)

Vulnerability from cvelistv5 – Published: 2026-09-14 16:49 – Updated: 2026-09-14 18:53

Title

gettext-converter: Prototype pollution in js2i18next() via crafted translation keys

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.

Severity

8.3 (High)


                        
                          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

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 18:53 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/locize/gettext-converter/secur…	x_refsource_CONFIRM
https://github.com/locize/gettext-converter/issues/15	x_refsource_MISC
https://github.com/locize/gettext-converter/commi…	x_refsource_MISC
https://github.com/locize/gettext-converter/relea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
locize	gettext-converter	Affected: < 1.3.3

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
          {
            "other": {
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T18:53:33.771788Z",
                "version": "2.0.3"
              },
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        ],
        "title": "CISA ADP Vulnrichment"
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        {
          "product": "gettext-converter",
          "vendor": "locize",
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            {
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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        },
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          "tags": [
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        },
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          ],
          "url": "https://github.com/locize/gettext-converter/releases/tag/v1.3.3"
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      ],
      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "gettext-converter: Prototype pollution in js2i18next() via crafted translation keys"
    }
  },
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Find a vulnerability

Search criteria

2 vulnerabilities found for gettext-converter by locize

CVE-2026-55451 (GCVE-0-2026-55451)

CVE-2026-55451 (GCVE-0-2026-55451)