CVE-2026-44435 — Quicly: Remote Denial of Service via assertion failure when CRYPTO stream handshake data exceeds 32KB
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 numb…
Published: 2026-07-16 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7