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Oracle Java SE CVE-2026-46917

| EUVDEUVD-2026-46459 MEDIUM
Improper Access Control (CWE-284)
2026-07-21 oracle GHSA-x5x7-pvpw-w5hv
Authentication Bypass Denial Of Service Java Oracle Oracle Java Se Oracle Graalvm Enterprise Edition Oracle Graalvm For Jdk Oracle Corporation
5.3
CVSS 3.1 · Vendor: oracle
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Identify Java TLS service endpoint
  2. Exploit
    Send crafted TLS handshake or protocol data
  3. Execution
    Trigger JSSE processing anomaly
  4. Impact
    Cause partial availability degradation of targeted service

Vulnerability Assessment

Weakness
CWE
CWE-284
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

The target system must be running one of the confirmed affected versions of Oracle Java SE (11.0.31, 17.0.19, 21.0.11, 25.0.3, or 26.0.1), Oracle GraalVM for JDK (17.0.19 or 21.0.11), or Oracle GraalVM Enterprise Edition (21.3.18). The application must expose a TLS endpoint that accepts connections from untrusted network sources and processes them via JSSE APIs - for example, a server-side Java web service. Oracle explicitly excludes Untrusted Java Web Start applications and Untrusted Java applets as valid attack vectors, meaning the vulnerability is strictly server-side API exploitation. Exploitation is further limited by the partial DoS impact ceiling (A:L) - full service availability collapse is not achievable through this vector alone. Deployments that have already applied the July 2026 CPU patches, or that route all external TLS through a non-Java termination proxy, are not directly exposed.
Impact

The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) accurately captures a remotely exploitable, unauthenticated, low-complexity flaw with no privilege requirements and no scope change, but with only partial availability impact. There is no EPSS score provided, no CISA KEV listing, and no public proof-of-concept - three signals that collectively indicate this has not attracted active exploitation tooling. The attack surface is bounded: only Java applications that expose TLS endpoints via JSSE APIs and accept connections from untrusted sources are reachable. The partial DoS classification (A:L rather than A:H) means sustained exploitation would degrade rather than completely collapse a service. For large-scale Java server deployments this is a credible denial-of-service risk given AC:L, but the absence of confidentiality or integrity impact and the lack of exploit activity place this firmly in the 'patch within normal cycle' category rather than emergency response. No conflicting signals detected in the available data.
Exploit ScenarioDerived

An unauthenticated remote attacker identifies a network-exposed Java application handling TLS connections via JSSE APIs - for example, a REST web service or RPC endpoint. The attacker sends crafted TLS handshake or protocol data designed to trigger anomalous processing within the JSSE component, causing CPU or memory resource exhaustion sufficient to degrade service responsiveness for legitimate clients. With AC:L and no authentication barrier, this could be scripted and repeated to sustain availability degradation, though no public proof-of-concept code is available at time of analysis.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 22, 2026

Partial denial-of-service exposure in the JSSE component of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition allows unauthenticated remote attackers to degrade service availability by supplying malformed data via TLS. Affected releases span five Oracle Java SE versions (11.0.31 through 26.0.1) and both GraalVM product lines, as disclosed in Oracle's CPU July 2026 advisory (EUVD-2026-46459). No public exploit identified at time of analysis and no CISA KEV listing; the CVSS 5.3 rating reflects a genuine but bounded availability impact rather than a critical or confidentiality-affecting risk.

RemediationAI

Apply the Oracle Critical Patch Update released in July 2026, available at https://www.oracle.com/security-alerts/cpujul2026.html, which addresses this vulnerability across all three affected product lines. Exact patched version numbers are not independently confirmed in the available data beyond the CPU advisory itself - consult the advisory's patch matrix for the specific fix versions applicable to each Java SE and GraalVM release train. As an interim compensating control where immediate patching is not possible, place a hardened TLS-terminating reverse proxy (such as nginx or HAProxy) in front of Java application endpoints to absorb malformed TLS traffic before it reaches the vulnerable JSSE layer; note this adds latency and an additional infrastructure component to maintain. Restricting network access to TLS endpoints to known-trusted IP ranges reduces the attacker pool but does not eliminate the vulnerability for services that must accept public connections.

Affected VersionsENISA

Oracle Java SE 17.0.19
Oracle Java SE 11.0.31
Oracle GraalVM for JDK 17.0.19
Oracle GraalVM for JDK 21.0.11
Oracle Java SE 21.0.11
Oracle GraalVM Enterprise Edition 21.3.18
Oracle Java SE 26.0.1
Oracle Java SE 25.0.3

Affected Packages

euvd oracle_graalvm_enterprise_edition no fix
euvd oracle_graalvm_for_jdk no fix
euvd oracle_java_se no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in euvd

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Technical ContextAI · show details

JSSE (Java Secure Socket Extension) is Oracle's built-in TLS/SSL implementation within the Java platform, providing the javax.net.ssl API surface used by virtually all Java server-side applications for encrypted network communication. The vulnerability lies in how the JSSE component processes TLS protocol data supplied by external callers - specifically through server-facing APIs rather than browser plugin vectors such as Java Web Start or applets. No CWE has been assigned by Oracle, so the precise root cause class is unconfirmed; common JSSE DoS patterns involve anomalous handshake state machine transitions, unbounded resource allocation during certificate or extension processing, or processing loops triggered by malformed TLS records. CPE identifiers confirm three distinct product lines are affected: oracle_corporation:oracle_java_se, oracle_corporation:oracle_graalvm_for_jdk, and oracle_corporation:oracle_graalvm_enterprise_edition, spanning both standard and enterprise GraalVM distributions.

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Severity by source

Vendor (oracle) PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
vuln.today AI 5.3 MEDIUM

Network-accessible TLS service, no authentication or privileges required; impact is strictly partial availability with confirmed zero confidentiality or integrity effect.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE MEDIUM
Red Hat 5.3 MEDIUM

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

DescriptionCVE.org

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 11.0.31, 17.0.19, 21.0.11, 25.0.3, 26.0.1; Oracle GraalVM for JDK: 17.0.19 and 21.0.11; Oracle GraalVM Enterprise Edition: 21.3.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via TLS to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Threat Intelligence Overview

EPSS Score
0.3%
Top 79% exploitable
Prevalence
High
Oracle Java SE dominates enterprise server-side application runtimes globally
Data Quality
6 sources
Confidence: High
EUVD 🇯🇵JVN NVD CVE.org EPSS MSRC Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
High

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-284 – Improper Access Control

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:42880 ADVISORY https://access.redhat.com/errata/RHSA-2026:42881 ADVISORY https://access.redhat.com/errata/RHSA-2026:42882 ADVISORY https://access.redhat.com/errata/RHSA-2026:42887 ADVISORY https://access.redhat.com/errata/RHSA-2026:42889 ADVISORY https://access.redhat.com/errata/RHSA-2026:42893 ADVISORY https://access.redhat.com/errata/RHSA-2026:42895 ADVISORY https://access.redhat.com/errata/RHSA-2026:42897 ADVISORY https://access.redhat.com/errata/RHSA-2026:42898 ADVISORY https://access.redhat.com/errata/RHSA-2026:42900 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-46917 ADVISORY https://ubuntu.com/security/notices/USN-8681-1 ADVISORY https://vuldb.com/vuln/381105 ADVISORY https://www.oracle.com/security-alerts/cpujul2026.html

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