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Vulnerability record · public intelligence
CVE-2021-25912
CRITICAL
Prototype pollution in dotty
Published Feb 2, 2021 · Updated Oct 23, 2026 · Also known as GHSA-f5c9-x9j6-87qp
Severity · CVSSCRITICAL · 9.8
Known exploitationNot listed
EPSS / likelihood3.34%
QFinch risk score20 / 100
Original summary
Normalized public record · Updated Oct 23, 2026
Prototype pollution in dotty
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Prototype pollution vulnerability in 'dotty' before version 0.1.1 allows attackers to cause a denial of service and may lead to remote code execution.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
CVENVDOSVEPSSGHSA
- SSVC priority
- MEDIUM
- Confidence
- 20%
- Aliases
- GHSA-f5c9-x9j6-87qp
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Feb 2, 2021 · Last refreshed Oct 23, 2026