CVE-2026-1002: The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by

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MEDIUM 5.3REMOTEUPGRADE

CVE-2026-1002 is a medium-severity flaw (CVSS 5.3) affecting vert.x-web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI. The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895 Steps to reproduce Given a file served by the static handler, craft an URI that

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-01-15
Last modified	2026-06-17

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-15 21:16 UTCPublished CVE record published
2026-06-17 10:14 UTCUpdated Record last modified

eclipse vert.x-web UPGRADE

Affected: >= 4.0.0 and <= 4.5.23 · >= 5.0.0 and <= 5.0.6

Fixed in: newer than 5.0.6

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy vert.x-web || rpm -q vert.x-web || vert.x-web --version

2. UPGRADE to newer than 5.0.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vert.x-web

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vert.x-web

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 4.0.0 (Debian / Ubuntu)

apt-cache madison vert.x-web sudo apt install vert.x-web=<VERSION_BEFORE_4.0.0> sudo apt-mark hold vert.x-web

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

dnf --showduplicates list vert.x-web sudo dnf downgrade vert.x-web-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add vert.x-web

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-2026-1002?

vert.x-web: upgrade to newer than 5.0.6. Exact commands for each OS are on this page.

Is CVE-2026-1002 being exploited?

CVE-2026-1002 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-2026-1002 affect?

CVE-2026-1002 affects vert.x-web. Severity is medium (CVSS 5.3). The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI. The issue comes from an improper implementation of the C. rule of section 5.

How urgent is CVE-2026-1002?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

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References

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