CVE-2026-94450

Description

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.

CVSS Vector

References

• https://aws.amazon.com/security/security-bulletins/2026-116-aws/
• https://github.com/aws/s2n-quic/releases/tag/v1.89.0
• https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x