Prototype Pollution in mithril
Affected versions of mithrilare vulnerable to prototype pollution. The function parseQueryString may allow a malicious user to modify the prototype of Object, causing the addition or modification of an existing property that will exist on all objects. A payload such as __proto__%5BtoString%5D=123 in the query string would change the toString() function to 123.
Recommendation
If you are using mithril 2.x, upgrade to version 2.0.2 or later. If you are using mithril 1.x, upgrade to version 1.1.7 or later.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | mithril | < 1.1.7, >= 2.0.0, < 2.0.2 | 1.1.7, 2.0.2 |
References
- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
mithril- Disclosed
- 03.09.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-c3px-v9c7-m734 - CC BY 4.0
Vulnerability history: mithril
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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