CVE-2026-8484

Application crash via undersized ioctl argument array

Published Jun 16, 2026 · Updated Jun 16, 2026

Heap-based buffer overflow in FuseSource Jansi 2.4.3 and earlier allows local users to crash a Java application through the JNI ioctl wrapper. The native wrapper forwards an integer argument array to ioctl without verifying that its size satisfies the selected request. Reachability requires local access to an application path that invokes the wrapper and passive user interaction; the documented consequence is heap corruption and an application crash.

CVSS severity4.8
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in FuseSource Jansi 2.4.3 and earlier allows local users to crash a Java application through the JNI ioctl wrapper. The native wrapper forwards an integer argument array to ioctl without verifying that its size satisfies the selected request. Reachability requires local access to an application path that invokes the wrapper and passive user interaction; the documented consequence is heap corruption and an application crash.

The record

CVE
CVE-2026-8484
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
FuseSource
Product
Jansi
Classifications
CWE-1284, CWE-122, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.4.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

FuseSource · Jansiversion=0 <=2.4.3

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.0Red Hat Product SecurityCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
4.8CERT PolskaCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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