Security vulnerabilities and automated fixes for h3 issues
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A high-severity Server-Sent Events (SSE) injection vulnerability (CVE-2026-33128) was discovered in the h3 HTTP framework, where unsanitized newline characters in event stream fields could allow attackers to inject arbitrary SSE messages. The fix upgrades h3 from version 1.15.5 to 1.15.6 in the frontend's dependency tree, ensuring that newline characters are properly sanitized before being written to event streams.