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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-09 · updated 2026-09-14
Weakness: CWE-400

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.

Affected products

Spring Micrometer: from 1.16.0 before 1.16.5.1; from 1.15.0 before 1.15.11.1 — fixed in 1.15.11.1, 1.16.5.1

How to fix

Upgrade to a fixed version: Spring Micrometer 1.15.11.1, 1.16.5.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40983.json

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