CVE-2026-94450 (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0194

Probability of exploitation

0.80%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1284 CWE-1284

References

Other References

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/security/advisories/GHSA-5rw2-6x5m-v22x

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-94450? +

CVE-2026-94450 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0194, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-94450? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-94450