# CVE-2026-94450: Potential denial of service when configured to send Retry packets in s2n-quic

> CVE-2026-94450: Potential denial of service when configured to send Retry packets in s2n-quic. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-94450
Last updated: 2026-10-20T19:19:24Z

- Published: 2026-09-22 20:04 UTC · Updated: 2026-10-20 19:19 UTC · Assigner: AMZN
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 1.9%, 80th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1284, CWE-617

## 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.

## Affected vendors and products

- AWS: s2n-quic

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-94450)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-94450)
- [https://aws.amazon.com/security/security-bulletins/2026-116-aws/](https://aws.amazon.com/security/security-bulletins/2026-116-aws/)
- [https://github.com/aws/s2n-quic/releases/tag/v1.89.0](https://github.com/aws/s2n-quic/releases/tag/v1.89.0)
- [https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x](https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-94450 · Markdown: https://rewindex.com/cve/CVE-2026-94450.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-94450 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:24.357Z