CVE-2026-59295: Micrometer instrumentation of Apache HttpAsyncClient DoS vulnerability

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-24 · updated 2026-10-12

Description

It is possible for outbound HTTP requests using a Micrometer-instrumented client to cause a denial-of-service (DoS) condition due to an unbounded memory leak. Micrometer 1.17.0 Micrometer 1.16.0 - 1.16.6 Micrometer 1.15.0 - 1.15.12 Micrometer 1.14.0 - 1.14.16 Micrometer 1.9.18 and earlier

Affected products

Spring Micrometer: from 1.16.0 through 1.16.6; from 1.15.0 through 1.15.12; from 1.14.0 through 1.14.16; through 1.9.18; 1.17.0

References

https://spring.io/security/cve-2026-59295

Get alerted when CVE-2026-59295 or the next vulnerability affects your stack