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CVE-2026-40984 is a high-severity denial-of-service vulnerability in Micrometer HTTP server instrumentation. Specially crafted HTTP requests can trigger uncontrolled resource consumption in applications using vulnerable Micrometer components, causing the application to spend excessive resources while processing instrumented HTTP traffic. The issue affects micrometer-core versions 1.16.0 through 1.16.5, 1.15.0 through 1.15.11, 1.14.0 through 1.14.15, 1.13.0 through 1.13.18, and 1.9.0 through 1.9.17, as well as micrometer-jetty11 and micrometer-jetty12 versions 1.13.0 through 1.16.5 on their respective supported branches. The weakness is classified as CWE-400, indicating uncontrolled resource consumption in the HTTP server metrics instrumentation path.
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A Micrometer high-severity HTTP server denial-of-service vulnerability mentioned in a list of recent Spring ecosystem advisories.
A denial-of-service vulnerability in Micrometer HTTP server instrumentations affecting Micrometer / Micrometer-core / jetty11 / jetty12 multiple versions.
A denial-of-service vulnerability in Micrometer HTTP server instrumentations that can be triggered by specially crafted HTTP requests when affected Micrometer components are in use and metrics are recorded through the instrumentation.
A high-severity denial-of-service vulnerability in Micrometer's HTTP server instrumentation that allows unauthenticated remote attackers to exhaust server resources using crafted HTTP requests.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.