CVE-2026-40557: Improper Certificate Validation via Global SSL Context Downgrade in Apache Storm Prometheus Reporter Version

Routine

MEDIUM 4.8REMOTEWATCHLISTUPGRADE

CVE-2026-40557 is a medium-severity flaw (CVSS 4.8) affecting storm prometheus reporter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.reporter.plugin.prometheus.skip_tls_validation (by default it is disabled) intending to affect only the Prometheus reporter, the undocumented global side effect creates an attack surface across every TLS-protected

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-04-27
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-27 14:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apache storm prometheus reporter UPGRADE

Affected: >= 2.6.3 and < 2.8.7

Fixed in: 2.8.7

Safe to downgrade to: a release before 2.6.3

1. Check installed version

apt-cache policy storm-prometheus-reporter || rpm -q storm-prometheus-reporter || storm-prometheus-reporter --version

2. UPGRADE to 2.8.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade storm-prometheus-reporter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade storm-prometheus-reporter

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.6.3 (Debian / Ubuntu)

apt-cache madison storm-prometheus-reporter sudo apt install storm-prometheus-reporter=<VERSION_BEFORE_2.6.3> sudo apt-mark hold storm-prometheus-reporter

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list storm-prometheus-reporter sudo dnf downgrade storm-prometheus-reporter-<VERSION_BEFORE_2.6.3> sudo dnf versionlock add storm-prometheus-reporter

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40557?

storm prometheus reporter: upgrade to 2.8.7. Exact commands for each OS are on this page.

Is CVE-2026-40557 being exploited?

CVE-2026-40557 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40557 affect?

CVE-2026-40557 affects storm prometheus reporter. Severity is medium (CVSS 4.8). 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.rep

How urgent is CVE-2026-40557?

Priority 29/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Prometheus vulnerabilities

References

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