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.
Published: 2026-09-22
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Tue, 22 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Potential denial of service when configured to send Retry packets in s2n-quic
First Time appeared Aws
Aws s2n-quic
Weaknesses CWE-1284
CPEs cpe:2.3:a:aws:s2n-quic:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws s2n-quic
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Subscriptions

Aws S2n-quic
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-09-22T20:05:59.298Z

Reserved: 2026-09-21T16:50:04.257Z

Link: CVE-2026-94450

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-22T21:17:33.867

Modified: 2026-09-22T21:17:33.867

Link: CVE-2026-94450

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-1284

    Improper Validation of Specified Quantity in Input