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Vulnerability · Published May 6, 2026 · Assigned by eclipse

CVE-2026-6860

Medium 6.9

In plain English

A medium-severity improper certificate validation in Eclipse Vert.x from Eclipse Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.2%top 85.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenio.vertx:vertx-coreno fix listedGHSA-3g76-f9xq-8vp6
Mavenio.vertx:vertx-coreno fix listedGHSA-3g76-f9xq-8vp6
Mavenio.vertx:vertx-core4.5.27GHSA-3g76-f9xq-8vp6
Mavenio.vertx:vertx-core5.0.12GHSA-3g76-f9xq-8vp6

Affected products (as reported)

VendorProductVersions
Eclipse Foundation Eclipse Vert.x 4.3.4 – through 4.5.265.0.0 – through 5.0.11

Weakness: CWE-295 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

References