h3 vulnerabilities

Browse known CVEs and advisories by package and ecosystem. Severity tells you the worst case. What determines real risk is whether the vulnerable code actually runs in your applications.

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CVE-IDSeverityPackage summary
GHSA-FP4X-GGRF-WMC6Mediumh3: H3 has an Open Redirect via Protocol-Relative Path in redirectBack() Referer ValidationGHSA-Q5PR-72PQ-83V3Mediumh3: H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of ServiceGHSA-4HXC-9384-M385Mediumh3: h3: SSE Event Injection via Unsanitized Carriage Return (`\r`) in EventStream Data and Comment…CVE-2026-33490Lowh3: h3: Missing Path Segment Boundary Check in `mount()` Causes Middleware Execution on Unrelated…GHSA-72GR-QFP7-VWHWMediumh3: h3: Double Decoding in `serveStatic` Bypasses `resolveDotSegments` Path Traversal Protection via…GHSA-WR4H-V87W-P3R7Mediumh3: h3 has a Path Traversal via Percent-Encoded Dot Segments in serveStatic Allows Arbitrary File ReadCVE-2026-33131Highh3: h3 has a middleware bypass with one gadgetCVE-2026-33129Mediumh3: h3 has an observable timing discrepancy in basic auth utilsCVE-2026-33128Highh3: h3 has a Server-Sent Events Injection via Unsanitized Newlines in Event Stream FieldsCVE-2026-23527Highh3: h3 v1 has Request Smuggling (TE.TE) issue

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