CVE-2026-94450

Potential denial of service when configured to send Retry packets in s2n-quic

Published Sep 22, 2026 CVSS 4.0 · 8.7 High EPSS 1.9% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-617
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Oct 20, 2026, 6:11 PM
Reserved
Sep 21, 2026, 4:50 PM
Status
Awaiting Analysis
Published
Sep 22, 2026, 9:17 PM
Modified
Oct 20, 2026, 7:19 PM