CVE-2025-54803 js-toml is vulnerable to Prototype Pollution
A remote attacker can pollute the global Object prototype via malicious TOML input, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-54803?
CVE-2025-54803 is a high-severity vulnerability in sunnyadn js-toml, published on 5 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. In versions below 1.0.2, a prototype pollution vulnerability in js-toml allows a remote attacker to add or modify properties of the global Object.prototype by parsing a maliciously crafted TOML input. This is fixed in version 1.0.2.
Weakness: CWE-1321
Which versions are affected by CVE-2025-54803?
2 open source packages ship an affected version, including js-toml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
js-toml npm | All versions | 1.0.2 |
js-toml npm | All versions | 1.0.2 |
Products include Sunnyadn Js-Toml.
How do I fix CVE-2025-54803?
Upgrade js-toml to 1.0.2 or later.
Is CVE-2025-54803 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-54803 exists.
Other vulnerabilities in sunnyadn js-toml
Sources
Also known as GHSA-65fc-cr5f-v7r2.