CVE-2026-14456

/// Technical description

Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes

valid QUIC Initial packets for unknown destination connection IDs, it

can allocate and queue new incoming channels without enforcing any limit.

Impact summary: A remote peer that can make many Initial packets reach the

server listener faster than the application accepts connections, can cause the

memory allocated to store the per-channel state to grow without any limits,

potentially making the QUIC listener unavailable and causing Denial of Service.

CWE: CWE-770: Allocation of Resources Without Limits or Throttling

Description: The function that handles inbound QUIC packets uses

Connection-Id from the packet header to find an existing connection

(QUIC channel). If no existing connection is found and the packet

type is INITIAL, the function treats the packet as a new connection. It

allocates a new channel object and inserts it into a queue where it

waits to be accepted by the local application with SSL_accept(

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References