CARGO · JULY 2026 · EARLY WARNING

aws-smithy-http-server <= 0.66.4 Vulnerable to Slowloris DoS

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.

GHSA-JVXP-QMX7-GJPXSeverity: HIGH

aws-smithy-http-server versions <= 0.66.4 appear to be vulnerable to unauthenticated Slowloris denial of service attacks due to missing timeouts and connection limits.

What happened

An early warning has been issued regarding a potential vulnerability in aws-smithy-http-server versions <= 0.66.4. The issue, tracked as GHSA-JVXP-QMX7-GJPX, involves the allocation of resources without limits in the default serve() path, which could allow unauthenticated Slowloris denial of service attacks. This vulnerability is under investigation, and it is recommended to upgrade to version 0.66.5 as a precautionary measure. For more details, consult the primary sources.

How 0Day mitigates this

MATCHED TO YOUR ACTUAL DEPENDENCY GRAPH0Day matches every incoming threat signal against your GitHub organization’s full dependency graph, including transitive dependencies. If aws-smithy-http-server is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.

Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

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