CVE-2025-55195 @std/toml Prototype Pollution in Node.js and Browser
Attackers can pollute the prototype chain in Node.js and browsers via untrusted TOML data, 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
- None listed
What is CVE-2025-55195?
CVE-2025-55195 is a high-severity vulnerability in denoland std, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
@std/toml is the Deno Standard Library. Prior to version 1.0.9, an attacker can pollute the prototype chain in Node.js runtime and Browser when parsing untrusted TOML data, thus achieving Prototype Pollution (PP) vulnerability. This is because the library is merging an untrusted object with an empty object, which by default the empty object has the prototype chain. This issue has been patched in version 1.0.9.
Weakness: CWE-1321
Which versions are affected by CVE-2025-55195?
How do I fix CVE-2025-55195?
No fix has been published for CVE-2025-55195 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-55195 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55195 exists.
Sources
Also known as GHSA-crjp-8r9q-2j9r.