{"schema_version":1,"title":"H2o Quicly vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 4 vulnerabilities in H2o Quicly: 0 in the last 7 days and 4 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-44436, was published on 16 July 2026.","url":"https://junglewise.ai/threats/technologies/quicly","json_url":"https://junglewise.ai/threats/technologies/quicly.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/quicly","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":2,"all_time":4,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":4,"last_365_days":4},"latest":[{"cve":"CVE-2026-44436","cvss":7.5,"slug":"cve-2026-44436-h2o-quicly-denial-of-service-via-connection-id-buffer-overflow","title":"h2o Quicly denial of service via Connection ID buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-16T23:16:17.143+00:00","url":"https://junglewise.ai/threats/cve-2026-44436-h2o-quicly-denial-of-service-via-connection-id-buffer-overflow"},{"cve":"CVE-2026-44435","cvss":7.5,"slug":"cve-2026-44435-h2o-quicly-assertion-failure-in-crypto-stream-handling","title":"H2O Quicly assertion failure in CRYPTO stream handling","severity":"high","exploited":false,"published_at":"2026-07-16T23:16:17.01+00:00","url":"https://junglewise.ai/threats/cve-2026-44435-h2o-quicly-assertion-failure-in-crypto-stream-handling"},{"cve":"CVE-2026-44434","cvss":5.3,"slug":"cve-2026-44434-h2o-quicly-stateless-reset-injection-in-lib-quicly-c","title":"h2o Quicly stateless reset injection in lib/quicly.c","severity":"medium","exploited":false,"published_at":"2026-07-16T23:16:16.87+00:00","url":"https://junglewise.ai/threats/cve-2026-44434-h2o-quicly-stateless-reset-injection-in-lib-quicly-c"},{"cve":"CVE-2026-44433","cvss":5.3,"slug":"cve-2026-44433-h2o-quicly-resource-exhaustion-in-flow-control-credit-management","title":"h2o quicly resource exhaustion in flow control credit management","severity":"medium","exploited":false,"published_at":"2026-07-16T23:16:16.727+00:00","url":"https://junglewise.ai/threats/cve-2026-44433-h2o-quicly-resource-exhaustion-in-flow-control-credit-management"}],"weekly":[{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":4},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":0}],"related":[],"technology":{"hub":true,"name":"H2o Quicly","slug":"quicly","vendor":{"name":"H2o","slug":"h2o","url":"https://junglewise.ai/threats/vendors/h2o"},"aliases":[],"category":"library","homepage":"https://github.com/h2o/quicly","repo_url":"https://github.com/h2o/quicly","description":"Quicly is an implementation of the QUIC transport protocol written in C.","url":"https://junglewise.ai/threats/technologies/quicly"},"most_severe":[{"cve":"CVE-2026-44436","cvss":7.5,"slug":"cve-2026-44436-h2o-quicly-denial-of-service-via-connection-id-buffer-overflow","title":"h2o Quicly denial of service via Connection ID buffer overflow","severity":"high","exploited":false,"published_at":"2026-07-16T23:16:17.143+00:00","url":"https://junglewise.ai/threats/cve-2026-44436-h2o-quicly-denial-of-service-via-connection-id-buffer-overflow"},{"cve":"CVE-2026-44435","cvss":7.5,"slug":"cve-2026-44435-h2o-quicly-assertion-failure-in-crypto-stream-handling","title":"H2O Quicly assertion failure in CRYPTO stream handling","severity":"high","exploited":false,"published_at":"2026-07-16T23:16:17.01+00:00","url":"https://junglewise.ai/threats/cve-2026-44435-h2o-quicly-assertion-failure-in-crypto-stream-handling"},{"cve":"CVE-2026-44434","cvss":5.3,"slug":"cve-2026-44434-h2o-quicly-stateless-reset-injection-in-lib-quicly-c","title":"h2o Quicly stateless reset injection in lib/quicly.c","severity":"medium","exploited":false,"published_at":"2026-07-16T23:16:16.87+00:00","url":"https://junglewise.ai/threats/cve-2026-44434-h2o-quicly-stateless-reset-injection-in-lib-quicly-c"},{"cve":"CVE-2026-44433","cvss":5.3,"slug":"cve-2026-44433-h2o-quicly-resource-exhaustion-in-flow-control-credit-management","title":"h2o quicly resource exhaustion in flow control credit management","severity":"medium","exploited":false,"published_at":"2026-07-16T23:16:16.727+00:00","url":"https://junglewise.ai/threats/cve-2026-44433-h2o-quicly-resource-exhaustion-in-flow-control-credit-management"}],"generated_at":"2026-09-28T03:07:00.154823+00:00"}