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GHSA-f4jp-rw7w-ccwg

MediumCVSS 6.9 / 10
Published Aug 20, 2026·Last modified Aug 20, 2026
Affected Components(1)
npm logogettext-converter
< 1.3.3
Description

Impact

js2i18next() is vulnerable to prototype pollution. When converting translations, it splits nested keys on the key separator (default ##) and uses each segment as a dynamic object key while building the output object. A key whose segment is __proto__ (e.g. __proto__##gcPolluted) causes the converter to resolve Object.prototype as the nested write target and assign the translated value onto it, polluting Object.prototype for the whole runtime.

Any application that converts translation data (PO / i18next JS objects) originating from an untrusted or user-controlled source is affected. Prototype pollution can lead to denial of service and, depending on the surrounding application, may enable further attacks.

Patches

Fixed in gettext-converter@1.3.3. Key segments equal to __proto__, constructor, or prototype are now rejected before being used as dynamic object keys.

Workarounds

Upgrade to 1.3.3. If upgrading is not immediately possible, sanitize/validate translation keys before passing them to js2i18next() and reject any key whose ##-separated segments include __proto__, constructor, or prototype.

Risk Scores
Base Score
6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
2.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-55451
    Alias

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Medium severity
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