{"id":"CVE-2026-94450","title":"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","summary":"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 s…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1284"],"vendor":"AWS","product":"s2n-quic","affected":["s2n-quic <= 1.88.0"],"published":"2026-09-22","updated":"2026-09-22","sourceUpdated":"2026-09-22T21:17:33.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94450","references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-116-aws/","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/aws/s2n-quic/releases/tag/v1.89.0","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x","label":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-22T21:11:40.327Z","slug":"CVE-2026-94450","body":"## Overview\n\nImproper 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.\n\n\n\nTo remediate this issue, users should upgrade to version v1.89.0 or later.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}