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HIGH

CVE-2026-94450

CVSS v3

7.5

HIGH

EPSS Score

1.9 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

CVSS v3 Vector
3.1
Published
2026-09-22
Last Modified
2026-09-23

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. The EPSS score is 1.9%, indicating 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 3.1.

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