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Vulnerability record · CVE-2026-94450 · published 22 September 2026

CVE-2026-94450: Improper validation of the Destination Connection ID length in s2n-quic 1.88.0 and earlier may allow an unauth…

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.

8.7 CVSS 4.0 High EPSS 1.9% · top 20.7% CWE-1284 · CWE-1284 Awaiting Analysis
8.7CVSS 4.0 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
23 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-94450), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.