Skip to content
Fencer Intel
medium 5.3

CVE-2026-6860 json

Vert.x has a DoS via unbounded server-side SNI SslContext cache growth

published 6mo ago modified 16d ago also EUVD-2026-27655 , GHSA-3g76-f9xq-8vp6

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.vertx:vertx-core 4.5.27, 5.0.12
  • eclipse vert.x 4.5.27, 5.0.12
  • io.vertx vertx-core 4.5.27, 5.0.12

Is CVE-2026-6860 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6860 updated cvss 5.3

eclipse-vertx/vert.x: eclipse-vertx/vert.x: Denial of Service via TLS handshake with wildcard server name

  • Red Hat Cryostat 4 vertx-core
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more
    affected: workaround, no fix available
  • Red Hat build of Apache Camel - HawtIO 4 vertx-core Red Hat build of Apache Camel 4 for Quarkus 3 vertx-core
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apicurio Registry 3 vertx-core
    affected: workaround, no fix available
  • Red Hat build of Debezium 3 vertx-core Red Hat build of Quarkus vertx-core Red Hat Data Grid 8 vertx-core Red Hat Enterprise Linux 8 resteasy, resteasy-javadoc Red Hat Enterprise Linux 9 resteasy, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer Red Hat Enterprise Linux 10 moditect
    +4 more products
    Red Hat Fuse 7 vertx-core Red Hat JBoss Enterprise Application Platform Expansion Pack vertx-core Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9, rhoai/odh-trustyai-service-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch210-py312-rhel9, +1 more Red Hat OpenShift Dev Spaces devspaces/server-rhel9, devspaces/multicluster-redirector-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-13, cryostat/jfr-datasource-rhel9 4.2.0-13, cryostat/cryostat-reports-rhel9 4.2.0-13
    fixed: vendor fix RHSA-2026:48151
  • Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:54622
  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-19, rhbk/keycloak-rhel9-operator 26.4-19, rhbk/keycloak-operator-bundle 26.4.13-1
    fixed: vendor fix RHSA-2026:30050
show 8 more
  • Red Hat build of Keycloak 26.4.13
    fixed: vendor fix RHSA-2026:30049
  • Red Hat build of Keycloak 26.6 rhbk/keycloak-rhel9 26.6-8, rhbk/keycloak-rhel9-operator 26.6-8, rhbk/keycloak-operator-bundle 26.6.4-2
    fixed: vendor fix RHSA-2026:30084
  • Red Hat build of Keycloak 26.6.4
    fixed: vendor fix RHSA-2026:30083
  • Red Hat build of Quarkus 3.27.4.SP1 vertx-core 4.5.28.redhat-00001
    fixed: vendor fix RHSA-2026:26018
  • Red Hat build of Quarkus 3.33.2.SP1 vertx-core 4.5.28.redhat-00001
    fixed: vendor fix RHSA-2026:26017
  • Red Hat Streams for Apache Kafka 2.9.4
    fixed: vendor fix RHSA-2026:34608
  • Red Hat Streams for Apache Kafka 3.2.1
    fixed: vendor fix RHSA-2026:54435
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-19, cryostat/cryostat-storage-rhel9 4.2.0-19, cryostat/cryostat-rhel9-operator 4.2.0-18, cryostat/cryostat-operator-bundle 4.2.0-11, cryostat/cryostat-agent-init-rhel9 0.7.0-11, cryostat/cryostat-grafana-dashboard-rhel9 4.2.0-13, +1 more Red Hat build of Quarkus 3.27.4.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.2.SP1 jna 5.8.0, bson 5.6.4, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1018 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
6mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • gitlab.eclipse.org https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/381 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-3g76-f9xq-8vp6 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 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
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 4.0 6.9 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
maven io.vertx:vertx-core
>=4.3.4, <=4.3.8
>=4.4.0, <=4.4.9
>=4.5.0, <4.5.27
>=5.0.0, <5.0.12
4.5.27
5.0.12

Affected products

  • Eclipse Foundation Eclipse Vert.x

Classification

Weakness
  • CWE-295 Improper Certificate Validation
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.