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Fencer Vulns
medium 4.8

CVE-2026-8484 json

Heap buffer overflow in Jansi

published 2026-06-16 4 mo ago modified 2026-10-26 13 d ago also EUVD-2026-37064

cvss
4.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

A heap buffer overflow vulnerability exists in the Jansi JNI "ioctl()" wrapper due to a lack of size verification for the argument array before the system call. This can lead to heap corruption and application crashes (DoS). All versions are believed to be vulnerable. This project is unmaintained at the time of CVE assignment.

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-2026-8484 updated cvss 5.0

jansi: org.fusesource.jansi/jansi: Jansi: Heap buffer overflow leads to Denial of Service

  • Red Hat Cryostat 4 jansi 2.4.0.redhat-00004 Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-cli-rhel9, mta/mta-java-external-provider-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins 2.516.3.1758299374-3.el8 Red Hat build of Apache Camel - HawtIO 4 jansi 2.4.0.redhat-00004 Red Hat build of Apache Camel 4 for Quarkus 3 jansi 2.4.0.redhat-00004
    +17 more products
    Red Hat build of Apache Camel for Spring Boot 4 jansi.dll Red Hat build of Apicurio Registry 3 jansi 2.4.0.redhat-00004 Red Hat Build of Keycloak rhbk-keycloak-rhel9, rhbk-openshift-rhel9, jansi 2.4.0.redhat-00004 Red Hat build of OpenJDK Konflux Container Build ubi10/openjdk-21, ubi10/openjdk-25 Red Hat Data Grid 8 jansi 2.4.0.redhat-00004 Red Hat Enterprise Linux 7 groovy, jansi-javadoc, groovy-javadoc, jansi 2.4.1-5.el10 Red Hat Enterprise Linux 8 sisu, guava, jansi, jline, jsoup, maven, +61 more Red Hat Enterprise Linux 9 sisu, guava, jansi, maven, slf4j, jsr-305, +31 more Red Hat Enterprise Linux 10 jansi 2.4.1-5.el10 Red Hat JBoss Enterprise Application Platform 7 jansi 2.4.0.redhat-00004, eap74-els-openjdk8-openshift-rhel8, eap74-els-openjdk11-openshift-rhel8, eap74-els-openjdk17-openshift-rhel8, jboss-eap-7-eap74-els-openjdk8-openshift-rhel8, jboss-eap-7-eap74-els-openjdk17-openshift-rhel8 Red Hat JBoss Enterprise Application Platform 8 jansi 2.4.0.redhat-00004, jboss-eap-8-tech-preview-eap81-openjdk17-builder-openshift-rhel9 Red Hat JBoss Enterprise Application Platform Expansion Pack jansi 2.4.0.redhat-00004 Red Hat OpenShift AI (RHOAI) rhoai/odh-trustyai-service-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9 Red Hat Single Sign-On 7 jansi 2.4.0.redhat-00004 Red Hat streams for Apache Kafka 2 jansi 2.4.0.redhat-00004 Red Hat streams for Apache Kafka 3 jansi 2.4.0.redhat-00004
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.27.5
    fixed: vendor fix RHSA-2026:53643
  • Red Hat build of Quarkus 3.33.3
    fixed: vendor fix RHSA-2026:51653

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
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 4.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 4.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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

Affected products

  • FuseSource jansi

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns 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.