CVE-2026-94450
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.
- Published Sep 22, 2026
- CVSS 8.7 high
- 1.9% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
In the news
- CVE-2026-94450 - Potential denial of service when configured to send Retry packets in s2n-quic AWS Security Bulletins ·