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Vulnerabilities

Vulnerability · CVE-2026-94450

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

Published Sep 22, 2026 · catalog updated Oct 20, 2026 · Amazon Web Services

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-94450. EPSS is 1.94%. Act only if a listed version of Amazon Web Services is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.94%
Remediation
Version ranges on file
Affected products
stated named in the record

Bulletin ID: 2026-116-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/22/2026 13:00 PM PDT Description: s2n-quic is a Rust implementation of the QUIC protocol. We identified CVE-2026-94450, an issue with improper validation of the Destination Connection ID length when a server is configured to send Retry packets. s2n-quic 1.88.0 and earlier allow an unauthenticated user to shut down a server endpoint via a single crafted UDP datagram. No AWS services are affected by this issue, and customers of AWS

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 1.88.0

How to fix CVE-2026-94450

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-94450. EPSS is 1.94%. Act only if a listed version of Amazon Web Services is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 1.88.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1284; CWE-617. EPSS 1.94%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 22, 2026 · NIST NVD

    Detected

    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.

  2. Oct 20, 2026 · NIST NVD

    Updated

    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.

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-94450

    Bulletin ID: 2026-116-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/22/2026 13:00 PM PDT Description: s2n-quic is a Rust implementation of the QUIC protocol. We identified CVE-2026-94450, an issue with improper validation of the Destination Conn

    aws.amazon.com
  • CVE.orgVulnerability recordCVE-2026-94450

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-94450

    30-day exploitation probability 1.94%

    first.org
  • NIST NVDVulnerability recordCVE-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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • AWS Security BulletinsOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • NIST NVDOct 21, 2026