CVE-2026-94450: Aws s2n-Quic

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

Improper validation of the Destination Connection ID length in s2n-quic 1.88.0 and earlier may allow an unauthenticated remote user to cause a denial of service by shutting down a server endpoint via a single crafted UDP datagram. Only server endpoints specifically configured to send Retry packets are affected. To remediate this issue, users should upgrade to version v1.89.0 or later.

Affected products

• Aws s2n-Quic: up to and including 1.88.0

Published 2026-09-22. Last modified 2026-09-23.