medium · CVSS v3 3.7 · CVSS v4 6.3

CVE-2026-123561

devalue before 5.9.3 allows malformed null-prototype object keys to bypass parse's __proto__ rejection through property-…

Description

devalue before 5.9.3 allows malformed null-prototype object keys to bypass parse's __proto__ rejection through property-key coercion, an incomplete fix for GHSA-mwv9-gp5h-frr4. Attackers can supply crafted payloads that yield objects with a __proto__ own property, which alone does not cause prototype pollution.

Scores

Severity
medium
CVSS v2
2.6
CVSS v3
3.7
CVSS v4
6.3
EPSS
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