CVE-2026-94450 s2n-quic - Denial of Service

s2n-quic <= 1.88.0 contains a denial of service caused by improper validation of Destination Connection ID length in server endpoints configured to send Retry packets, letting unauthenticated remote attackers shut down the server via crafted UDP datagram.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
1.94% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-1284

Vendor fix

Upgrade to version v1.89.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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