High 7.5Published Sep 22, 2026

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

Updated under an hour ago (2026-10-19 06:10 UTC)

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It affects AWS s2n-quic. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS s2n-quic

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Sep 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS s2n-quic aws:s2n_quic (from the name)	through 1.88.0	CNA record

References

https://github.com/aws/s2n-quic/releases/tag/v1.89.0patch, release-notes
https://aws.amazon.com/security/security-bulletins/2026-116-aws/vendor-advisory
https://github.com/aws/s2n-quic/security/advisories/GHSA-5rw2-6x5m-v22xrelease-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.