Prototype pollution in mout
Priority LOW 37CWE-1321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
This affects all versions of package mout. The deepFillIn function can be used to 'fill missing properties recursively', while the deepMixIn mixes objects into the target object, recursively mixing existing child objects as well. In both cases, the key used to access the target object recursively is not checked, leading to exploiting this vulnerability. **Note:** This vulnerability derives from an incomplete fix of [CVE-2020-7792](https://security.snyk.io/vuln/SNYK-JS-MOUT-1014544).
Why it matters now
EPSS 0.02149 82nd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed mout (npm): 1.2.4
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | mout | all versions | — | No fix listed | CNA |
| — | mout (npm) | before 1.2.4 | 1.2.4 | Patch available | GHSA-vvv8-xw5f-3f88 |
- mout Vendor— Affected all versions Fixed in — No fix listed CNA
- mout (npm) Vendor— Affected before 1.2.4 Fixed in 1.2.4 Patch available GHSA-vvv8-xw5f-3f88
Remediation
- Fix · GHSA-vvv8-xw5f-3f88 mout (npm) Fixed in 1.2.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2022-21213
- 2026-10-03 Alias added: GHSA-vvv8-xw5f-3f88
References
Exploit 2
More Moutjs Mout vulnerabilities
- TI-2020-06308 Prototype pollution in mout CVSS 3.1HIGH 7.5
Sources
- CVE-2022-21213 · CVE Program
- CVE-2022-21213 · NVD
- FIRST EPSS
- GHSA-vvv8-xw5f-3f88 · GitHub Advisory Database · CC BY 4.0
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