H2O vulnerabilities and CVEs

Known vulnerabilities affecting H2O, with exploit availability attached to each one, so you can tell a flaw someone has written code for from one nobody has.

2 vulnerabilities tracked.

8.1 h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. CVE-2026-55368 4 Nov 2026
7.5 h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. CVE-2026-55367 4 Nov 2026

What this covers

This feed accumulates forward from the day it started storing records, and a name search that finds nothing here is also looked up against the registers directly — so an older advisory resolves even when it predates the corpus. It is still a reading view, not a substitute for the vendor's own advisory, and absence from this page is not a statement that H2O is free of vulnerabilities.

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H2O vulnerabilities and CVEs

What this covers

Other products tracked here