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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS s2n-quic unaffected
Version Status Constraints
0 affected ≤ 1.8.1

No data.

No data.

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Project Subscriptions

Vendors Products
Aws Subscribe
S2n-quic Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-042-aws/ cve-icon cve-icon
https://github.com/aws/s2n-quic/releases/tag/v1.82.0 cve-icon cve-icon
https://github.com/aws/s2n-quic/security/advisories/GHSA-9q54-f358-3fqf cve-icon cve-icon
History

Wed, 10 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 10 Jun 2026 19:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Excessive memory allocation in s2n-quic
First Time appeared Aws
Aws s2n-quic
Weaknesses CWE-770
CPEs cpe:2.3:a:aws:s2n-quic:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws s2n-quic
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-06-10T19:14:59.133Z

Reserved: 2026-06-03T13:13:46.286Z

Link: CVE-2026-10740

cve-icon Vulnrichment

Updated: 2026-06-10T19:14:32.421Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-10T19:16:32.470

Modified: 2026-06-10T20:19:35.917

Link: CVE-2026-10740

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T20:30:28Z

Weaknesses