CVE-2026-44435

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.5 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H                                    

Vulnerability Description

Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 937d0e9, an assertion failure is raised when the total number of valid handshake messages received over a CRYPTO stream of a single packet number space exceeds 32KB, causing a Denial of Service. This issue has been fixed by commit 937d0e9.

Vulnerability Details

Published Date

July 16, 2026

Last Modified

July 16, 2026

CWE ID

CWE-400

Source

NVD

Vendor

h2o

Product

quicly

External References

https://github.com/h2o/quicly/commit/937d0e9e7c669fc2bee4920632ab6aaac60e4d81
https://github.com/h2o/quicly/security/advisories/GHSA-2cw9-5673-73gv

CVE-2026-44435

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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