CVE-2026-6860: A TCP client can perform a TLS handshake and present the server name extension with a server name that is acce

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MEDIUM 5.3REMOTEUPGRADE

CVE-2026-6860 is a medium-severity flaw (CVSS 5.3) affecting vert.x. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.

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	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-770, CWE-295
Published	2026-05-06
Last modified	2026-10-26

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

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

Am I affected?

Timeline

2026-05-06 10:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

eclipse vert.x UPGRADE

Affected: >= 4.3.4 and <= 4.5.26 · >= 5.0.0 and <= 5.0.11

Fixed in: newer than 5.0.11

Safe to downgrade to: a release before 4.3.4

1. Check installed version

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

2. UPGRADE to newer than 5.0.11 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vert.x

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 4.3.4 (Debian / Ubuntu)

apt-cache madison vert.x sudo apt install vert.x=<VERSION_BEFORE_4.3.4> sudo apt-mark hold vert.x

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

dnf --showduplicates list vert.x sudo dnf downgrade vert.x-<VERSION_BEFORE_4.3.4> sudo dnf versionlock add vert.x

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-2026-6860?

vert.x: upgrade to newer than 5.0.11. Exact commands for each OS are on this page.

Is CVE-2026-6860 being exploited?

CVE-2026-6860 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-2026-6860 affect?

CVE-2026-6860 affects vert.x. Severity is medium (CVSS 5.3). A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com w

How urgent is CVE-2026-6860?

Priority 32/100. Public exploit reference; Remotely exploitable, no login, no user action

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References

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