What is CVE-2026-40557?

CVE-2026-40557 is a medium-severity vulnerability in Apache Storm_prometheus_reporter, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2026-04-27.

How severe is CVE-2026-40557?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Apache Storm_prometheus_reporter

CVE-2026-40557

Improper Certificate Validation via Global SSL Context Downgrade in Apache Storm Prometheus Reporter Versions Affected: from 2.6.3 to 2.8.6 Description: In production deployments where an administrator enables storm.daemon.metrics.re…

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (32.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Apache Storm_prometheus_reporter
Apache Software Foundation Storm Prometheus Reporter — versions 2.6.3

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-40557?: CVE-2026-40557 is a medium-severity vulnerability in Apache Storm_prometheus_reporter, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2026-04-27.
How severe is CVE-2026-40557?: Medium severity. CVSS v3 base score is 4.8 out of 10.