GHSA-c3px-v9c7-m734
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.
What each source reports
GitHub AdvisoriesNo score
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.
- Record
GHSA-c3px-v9c7-m734- Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVNo score
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.
- Record
GHSA-c3px-v9c7-m734- Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-c3px-v9c7-m734 is a vulnerability with no CVSS score yet in mithril, published September 3, 2020. No source lists public exploit code. Fixed in mithril 1.1.7.