CVE-2026-22028: Preact has JSON VNode Injection issue

January 7, 2026 (updated January 8, 2026)

Vulnerability Type: HTML Injection via JSON Type Confusion

Affected Versions: Preact 10.26.5 through 10.28.1

Severity: Low to Medium (see below)

References

github.com/advisories/GHSA-36hm-qxxp-pg3m
github.com/preactjs/preact
github.com/preactjs/preact/security/advisories/GHSA-36hm-qxxp-pg3m
nvd.nist.gov/vuln/detail/CVE-2026-22028

Code Behaviors & Features

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