CVE-2026-16756 | Missing connection and header-read timeouts and the absence … | CVSS 7.5 HIGH

Description

Missing connection and header-read timeouts and the absence of a concurrent-connection cap in the default serve() path of Amazon aws-smithy-http-server might allow remote attackers to cause a denial of service by opening many connections and sending partial requests that are never completed, exhausting server sockets and tasks. To mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later.

Metadata

CVE ID: CVE-2026-16756
State: PUBLISHED
Assigner: AMZN
Reserved: 2026-07-23 13:10 UTC
Published: 2026-07-23 18:32 UTC
Last updated: 2026-07-23 19:03 UTC
Primary CWE: CWE-770
CWE-770 Allocation of resources without limits or throttling
Vendor / Product: AWS / aws-smithy-http-server
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
AWS	aws-smithy-http-server	—	0 ≤ 0.66.4

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	CWE-770 Allocation of resources without limits or throttling

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (3)