CVE-2026-10740: Excessive memory allocation in s2n-quic

Published Jun 10, 2026
·
Updated

Unbounded memory allocation in the CRYPTO frame reassembler in s2n-quic before 1.8.2 may allow an unauthenticated remote actor to cause a denial of service (degraded availability) by sending crafted QUIC Initial packets.

To remediate this issue, users should upgrade to v1.8.2.

Affected Software

1 affected component
Amazon s2n-quic<1.8.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade s2n-quic to a version that resolves this vulnerability.

    Fixed in v1.8.2

Event History

Jun 10, 2026
CVE Published
via MITRE·06:09 PM
Data Sourced
via MITRE·06:09 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-10740?

The severity of CVE-2026-10740 is medium with a score of 5.3.

2

How do I fix CVE-2026-10740?

To fix CVE-2026-10740, users should upgrade to version 1.8.2 of Amazon s2n-quic.

3

What type of vulnerability is CVE-2026-10740?

CVE-2026-10740 is characterized by excessive memory allocation that can lead to a denial of service.

4

What impact does CVE-2026-10740 have on availability?

CVE-2026-10740 can cause degraded availability due to unbounded memory allocation.

5

Who is affected by CVE-2026-10740?

Users of Amazon s2n-quic prior to version 1.8.2 are affected by CVE-2026-10740.

Company

Resources

Contact

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CVE-2026-10740 - Excessive memory allocation in s2n-quic - SecAlerts