CVE-2026-47027Network attack vector

Unauthenticated service interruption

Published Jul 21, 2026 · Updated Jul 21, 2026

Denial of service in Oracle Java SE Libraries allows remote attackers to interrupt Java services through crafted API input. Oracle has not disclosed the affected library API or the incorrect operation it performs on untrusted input. Reachability requires a service that passes network data to the API or a sandboxed applet or Web Start deployment that runs untrusted code; the consequence is limited to partial service interruption.

CVSS severity5.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle Java SE Libraries allows remote attackers to interrupt Java services through crafted API input. Oracle has not disclosed the affected library API or the incorrect operation it performs on untrusted input. Reachability requires a service that passes network data to the API or a sandboxed applet or Web Start deployment that runs untrusted code; the consequence is limited to partial service interruption.

The record

CVE
CVE-2026-47027
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Oracle
Product
Java Platform, Standard Edition (Java SE)
Classifications
CWE-284, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 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=11.0.31
  2. Affected versionversion=17.0.19
  3. Affected versionversion=21.0.11
  4. Affected versionversion=25.0.3
  5. Affected versionversion=26.0.1
  6. Affected versionversion=8u491
  7. Affected versionversion=8u491-perf

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Java Platform, Standard Edition (Java SE)version=11.0.31; version=17.0.19; version=21.0.11; version=25.0.3; version=26.0.1; version=8u491; version=8u491-perf

Published CVSS scores

5.3OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1499Endpoint Denial of Service

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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