References to Advisories, Solutions, and Tools

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Change History

GitHub, Inc. AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

GitHub, Inc. CWE-617

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2

GitHub, Inc. https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562 [No types assigned]

GitHub, Inc. https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c [No types assigned]

GitHub, Inc. https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92 [No types assigned]

GitHub, Inc. https://h2o.examp1e.net/configure/http3_directives.html [No types assigned]