CVE-2026-94450

high

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 servic…

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.

CVSS

7.5

7.5 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity source: NVD CVSS v3.1 (ff89ba41-3aa1-4d27-914a-91399e9639e5)

Timeline (UTC)

Published: 2026-09-22 21:17

Modified: 2026-10-20 19:19

NVD status: Awaiting Analysis

Last synced 2 days ago

Verified against the source API 2026-10-27 06:55 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-617 CWE-1284

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

References

https://aws.amazon.com/security/security-bulletins/2026-116-aws/ ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/s2n-quic/releases/tag/v1.89.0 ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x ff89ba41-3aa1-4d27-914a-91399e9639e5

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:55 UTC · record ↗

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