CVE-2026-94450

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.

Overview

State: PUBLISHED
Assigner (CNA): AMZN
CVSS severity: HIGH
CVSS score: 8.7 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Effective score: 8.7 / 10 HIGH source: CNA overview
CWE(s): CWE-1284
Reserved: 2026-09-21
Published: 2026-09-22 20:04 UTC
Last updated: 2026-09-22 20:05 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/94xxx/CVE-2026-94450.json
Linked Threat: CVE-2026-94450 — Potential denial of service when configured to send Retry packets in s2n-quic

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 21:17:33 UTC
NVD last modified: 2026-09-22 21:17:33 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: ff89ba41-3aa1-4d27-914a-91399e9639e5
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84822
Assigner: AMZN
Published: Sep 22, 2026, 8:04:44 PM
Updated: Sep 22, 2026, 8:05:59 PM
EUVD base score (CVSS 4.0): 8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: aws
Products: s2n-quic (0 ≤1.88.0)

ENISA 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
AWS	s2n-quic	`0` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/aws/s2n-quic/releases/tag/v1.89.0 patchrelease-notes
https://aws.amazon.com/security/security-bulletins/2026-116-aws/ vendor-advisory
https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22x release-notes

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

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

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-94450: AWS S2n Quic Vulnerability (CVSS 7.5) | CVETodo

web:cvetodo.com

CVE-2026-94450 : Improper Validation of Specified Quantity in Input in AWS S2n Quic. Includes technical details, affected versions, and mitigation steps.

2026-09-23 15:13 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:13 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:13 UTC
About the security content of iOS 26.4.2 and iPadOS 26.4.2

web:support.apple.com

Notification Services Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later Impact: Notifications marked for deletion could be unexpectedly retained on the device Description: A logging issue was addressed with improved ...

2026-09-23 15:13 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:13 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

None of these is a clean fix , which is why the decision on how to remediate depends on knowing what package versions are running in production and why. This post will cover how AI has accelerated CVE detection and discovery, the upgrade trap, what CVE remediation actually involves in 2026 , and how to solve the CVE remediation problem.

2026-09-23 15:13 UTC
CVE-2026-94450 - Detail CVSS, EPSS & CISA Kev | CVE Find

web:www.cvefind.com

Full details for CVE-2026-94450 : technical description, impact, CVSS/EPSS scores, linked CWE, CAPEC, affected CPEs, disclosure date, and mitigation options.

2026-09-23 15:13 UTC
The 8 Best Automated Vulnerability Remediation Tools in 2026

web:www.openhands.dev

Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.

2026-09-23 15:13 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:13 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-94450.json.

{
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        {
          "defaultStatus": "unaffected",
          "product": "s2n-quic",
          "vendor": "AWS",
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            {
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              "version": "0",
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            }
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              "operator": "OR"
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            }
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            }
          ]
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      "providerMetadata": {
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        },
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        }
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      "source": {
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      },
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    "datePublished": "2026-09-22T20:04:44.360Z",
    "dateReserved": "2026-09-21T16:50:04.257Z",
    "dateUpdated": "2026-09-22T20:05:59.298Z",
    "state": "PUBLISHED"
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