Prototype Pollution in Style-dictionary

CVE-2026-54639

Style Dictionary, a build system for creating cross-platform styles, has a prototype pollution vulnerability starting in version 4.3.0 and prior to version 5.4.4. Impact users have: direct usage of `convertTokenData(tokens, { output: 'obje…

Vulnerability class: Prototype Pollution

EPSS: 0.001 (3.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-54639?
CVE-2026-54639 is a high-severity vulnerability in Style-dictionary, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.8/10. Published 2026-06-24.
How severe is CVE-2026-54639?
High severity. CVSS v3 base score is 8.8 out of 10.