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CVE-2026-16756 is a denial-of-service vulnerability in Amazon aws-smithy-http-server affecting versions up to and including 0.66.4. The issue is present in the default serve() path, which lacks connection timeouts, header-read timeouts, and a cap on concurrent connections. As a result, a remote attacker can hold large numbers of connections open by sending partial HTTP requests that are never completed, causing unbounded consumption of server sockets and task resources. The weakness is consistent with a Slowloris-style attack and results from allocation of resources without sufficient limits.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.