Known Vulnerabilities for products from H2o

Listed below are 13 of the newest known vulnerabilities associated with the vendor "H2o".

These CVEs are retrieved based on exact matches on listed vendor information (CPE data) as well as a keyword search to ensure the newest vulnerabilities with no officially listed vendor information are still displayed.

Data on known vulnerable products is also displayed based on information from known CPEs, each product links to its respective vulnerability page.

Known Vulnerabilities

CVE Shortened Description Severity Publish Date Last Modified
CVE-2026-54340 json h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplifi... Not Provided 2026-07-17 2026-08-05
CVE-2026-44453 json h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of... Not Provided 2026-07-16 2026-08-06
CVE-2026-44452 json h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello ... Not Provided 2026-07-16 2026-08-06
CVE-2026-44436 json Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 8b178e6... Not Provided 2026-07-16 2026-07-21
CVE-2026-44435 json Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 937d0e9... Not Provided 2026-07-16 2026-08-06
CVE-2026-44434 json Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit dccf5d4... Not Provided 2026-07-16 2026-08-06
CVE-2026-44433 json Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 8b178e6... Not Provided 2026-07-16 2026-08-06
CVE-2026-8752 json A weakness has been identified in h2oai h2o-3 up to 7402. This vulnerability affects the function exec of the file h2o-core/s... Not Provided 2026-05-17 2026-05-19
CVE-2026-8751 json A security flaw has been discovered in h2oai h2o-3 up to 7402. This affects the function importBinaryModel of the file h2o-co... Not Provided 2026-05-17 2026-05-19
CVE-2026-8750 json A vulnerability was identified in h2oai h2o-3 up to 7402. Affected by this issue is the function importFiles of the file h2o-... Not Provided 2026-05-17 2026-05-19
CVE-2026-3960 json A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 ve... Not Provided 2026-04-23 2026-05-19
CVE-2025-10769 json A vulnerability has been found in h2oai h2o-3 up to 3.46.08. This affects an unknown function of the file /99/ImportSQLTable ... Not Provided 2025-09-21 2026-04-29
CVE-2025-10768 json A flaw has been found in h2oai h2o-3 up to 3.46.08. The impacted element is an unknown function of the file /99/ImportSQLTabl... Not Provided 2025-09-21 2026-04-29

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