CVE-2026-94450
Published:September 22, 2026
Updated:September 23, 2026
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.
Affected Packages
https://github.com/aws/s2n-quic.git (GITHUB):
Affected version(s) >=v1.0.0 <v1.89.0Fix Suggestion:
Update to version v1.89.0s2n-quic-core (RUST):
Affected version(s) >=0.1.0 <0.89.0Fix Suggestion:
Update to version 0.89.0s2n-quic (RUST):
Affected version(s) >=1.0.0 <1.89.0Fix Suggestion:
Update to version 1.89.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Validation of Specified Quantity in Input