CVE-2025-55195
High
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.
SeverityHigh
CVSS7.3
Exploit probability—
ProductDenoland Std
PublishedAug 14, 2025
First seenAug 14, 2025
Weakness typeCWE-1321Prototype pollution
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| denoland std | < 1.0.9 | — |
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