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No exploitation reportedAwaiting NVD analysis

CVE-2026-94450

No exploitation reported by the sources we read.

  • Published2026-09-22
  • WeaknessCWE-1284 · CWE-617

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-09-2221:17CVE publishedNVD

Versions per branch

Products declared by the CNA

As AMZN, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • AWS s2n-quicother versions: not affected
    Affected
    • ≤ 1.88.0no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-20

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-94450 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-09-23
  • CNACVSS 4.08.7known since 2026-10-23
  • CNACVSS 3.17.5known since 2026-10-23
  • CNAweakness (CWE)CWE-1284, CWE-617known since 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-06

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-09-22
Last Modified
2026-10-20
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-94450?

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.

Is CVE-2026-94450 actively exploited?

Active exploitation of CVE-2026-94450 has not been confirmed. Its EPSS score was 1.9% on 2026-11-06, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-94450?

CVE-2026-94450 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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