# Micrometer gRPC server instrumentation DoS

Advisory record · `GHSA-w737-wx49-qj23`

- **Identifiers:** `GHSA-w737-wx49-qj23` · `CVE-2026-40983`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 9 Jun 2026
- **Updated:** 11 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Jun 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.micrometer:micrometer-core` (Maven): affected `>=1.16.0, <1.16.6 || >=1.15.0, <1.15.12`; fixed in `1.16.6`, `1.15.12`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Micrometer (io.micrometer:micrometer-core) versions 1.16.0 through 1.16.5 and 1.15.0 through 1.15.11 are vulnerable. A user who can send specially crafted gRPC requests to an affected service can cause a denial-of-service condition. The source gives few details about the exact mechanism. Upgrade to micrometer-core 1.16.6 or 1.15.12, depending on the release line in use.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 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`, from CNA (vmware)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0063, the 50th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-w737-wx49-qj23)

## Sources

- [GitHub Advisory Database: GHSA-w737-wx49-qj23](https://github.com/advisories/GHSA-w737-wx49-qj23)
- [OSV: GHSA-w737-wx49-qj23](https://osv.dev/vulnerability/GHSA-w737-wx49-qj23)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-40983>
- <https://access.redhat.com/errata/RHSA-2026:36839>
- <https://access.redhat.com/errata/RHSA-2026:41951>
- <https://access.redhat.com/errata/RHSA-2026:50848>
- <https://access.redhat.com/errata/RHSA-2026:50849>
- <https://access.redhat.com/errata/RHSA-2026:54435>
- <https://access.redhat.com/errata/RHSA-2026:62260>
- <https://access.redhat.com/errata/RHSA-2026:66488>
- <https://access.redhat.com/security/cve/CVE-2026-40983>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2486697>
- <https://github.com/micrometer-metrics/micrometer>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40983.json>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-w737-wx49-qj23>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-w737-wx49-qj23/>. Everything for agents: <https://agentprime.io/llms.txt>.