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

Quick assessment

Affected
AWS s2n-quic
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

s2n-quic是Amazon Web Services开源的一款高性能QUIC协议实现库。 s2n-quic 1.8.2之前版本存在安全漏洞，该漏洞源于CRYPTO帧重组器中无界内存分配，可能导致未经身份验证的远程攻击者通过发送特制QUIC Initial数据包造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS s2n-quic ≤ 1.8.1 affected
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I. Basic Information for CVE-2026-10740

Vulnerability Information
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Vulnerability Title
Excessive memory allocation in s2n-quic
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
s2n-quic 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
s2n-quic是Amazon Web Services开源的一款高性能QUIC协议实现库。 s2n-quic 1.8.2之前版本存在安全漏洞，该漏洞源于CRYPTO帧重组器中无界内存分配，可能导致未经身份验证的远程攻击者通过发送特制QUIC Initial数据包造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS s2n-quic 0 ~ 1.8.1 -

II. Public POCs for CVE-2026-10740

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III. Intelligence Information for CVE-2026-10740

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Vendor Advisories for CVE-2026-10740 (2)

Vendor Pages for CVE-2026-10740 (1)

IV. Related Vulnerabilities

Same product: s2n-quic
Same vendor: AWS
Same weakness: CWE-770

V. Comments for CVE-2026-10740

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