CVE-2025-57354 counterpart vulnerable to prototype pollution
Prototype pollution in the counterpart library allows attackers to inject properties into the Object prototype, potentially leading to remote code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-57354?
CVE-2025-57354 is a medium-severity code injection vulnerability in n/a, published on 24 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability exists in the 'counterpart' library for Node.js and the browser due to insufficient sanitization of user-controlled input in translation key processing. The affected versions prior to 0.18.6 allow attackers to manipulate the library's translation functionality by supplying maliciously crafted keys containing prototype chain elements (e.g., __proto__ ), leading to prototype pollution. This weakness enables adversaries to inject arbitrary properties into the JavaScript Object prototype through the first parameter of the translate method when combined with specific separator configurations, potentially resulting in denial-of-service conditions or remote code execution in vulnerable applications. The issue arises from the library's failure to properly validate or neutralize special characters in translation key inputs before processing.
Weakness: CWE-1321
Which versions are affected by CVE-2025-57354?
2 open source packages ship an affected version, including counterpart.
| Package | Affected | Fixed in |
|---|---|---|
counterpart npm | All versions to 0.18.6 | None |
counterpart npm | All versions to 0.18.6 | None |
How do I fix CVE-2025-57354?
No fix has been published for CVE-2025-57354 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-57354 being exploited?
There is no known exploitation of CVE-2025-57354 in the wild and no public exploit code.
Sources
Also known as GHSA-2488-w585-72ch.