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Oracle Java SE CVE-2026-70907

| EUVDEUVD-2026-61856 MEDIUM
Improper Access Control (CWE-284)
2026-08-18 secalert_us@oracle.com GHSA-x2cm-pmmm-v6xc
Authentication Bypass Denial Of Service Java Oracle Red Hat Suse
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 endpoint on network
  2. Exploit
    Send crafted TLS data to JSSE API
  3. Execution
    Trigger JSSE processing fault
  4. Impact
    Cause partial service availability degradation

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 application must be running one of the explicitly listed affected versions of Oracle Java SE (8u501, 11.0.32, 17.0.20, 21.0.12, 25.0.4, 26.0.2), GraalVM for JDK (17.0.20, 21.0.12), or GraalVM Enterprise Edition (21.3.19). The application must expose a TLS endpoint that directly processes incoming TLS data via JSSE APIs - this is the standard configuration for any Java HTTPS server. Exploitation is explicitly excluded through Untrusted Java Web Start applications or untrusted applets, meaning client-side Java deployments are not attack surfaces; only server-side applications accepting TLS connections are vulnerable. No authentication, user interaction, or privileged access is required from the attacker's perspective. The limiting factor is impact ceiling: only partial availability disruption is achievable - no code execution or data access is possible.
Impact

The CVSS 3.1 base score of 5.3 (Medium) reflects a low-complexity, network-accessible, unauthenticated vector (AV:N/AC:L/PR:N/UI:N) but with limited availability impact (A:L) and no confidentiality or integrity impact. Real-world risk is moderate: the combination of no authentication requirement, low attack complexity, and extremely wide deployment of Java SE across enterprise environments means this is easily reachable at scale, but the ceiling of impact is only partial service disruption - not RCE or data exposure. No EPSS score was provided in available data; given the lack of KEV listing and no known POC, exploitation probability is assumed low to moderate. SSVC considerations: exploitation is not confirmed automated or widespread; technical impact is partial; automatable is plausible given the low-complexity network vector. This issue is a legitimate patching priority for high-availability Java TLS services, but does not represent a critical emergency compared to code execution or data exfiltration vulnerabilities. The absence of a CWE assignment and no POC means the exact triggering condition is unconfirmed beyond Oracle's description.
Exploit ScenarioDerived

An unauthenticated external attacker identifies a Java web service (such as a REST API or SOAP service) with a TLS endpoint running an affected Java SE or GraalVM version. The attacker sends a series of specially crafted TLS messages to the JSSE-handling component of the service. This triggers a processing fault within JSSE that partially disrupts service availability, potentially causing degraded response times, connection failures, or thread exhaustion for legitimate users.
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 – Aug 19, 2026

Partial denial-of-service in Oracle Java SE's JSSE component allows unauthenticated remote attackers to degrade availability of applications using TLS APIs across a broad range of supported Java versions. Affected releases span Java SE 8 through 26, GraalVM for JDK 17 and 21, and GraalVM Enterprise Edition 21.3.19, making this a wide-blast-radius availability issue for the Java ecosystem. Exploitation is limited to availability impact only - no confidentiality or integrity compromise is possible - and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis.

RemediationAI

Apply Oracle's Critical Security Patch Update (CPU) for August 2026, available at https://www.oracle.com/security-alerts/cspuaug2026.html, which addresses this vulnerability for all affected Java SE and GraalVM versions. The exact patched versions are not individually enumerated in currently available data beyond the advisory reference - consult the Oracle CPU page for specific fixed build numbers for each release train. As a compensating control prior to patching, restrict network access to TLS endpoints on affected Java applications to trusted clients using firewall rules or reverse-proxy ACLs, reducing exposure to untrusted sources; note this does not eliminate risk from internal threat actors. Rate-limiting TLS handshakes at the load balancer or proxy layer can reduce the impact of partial DoS attempts. Upstream-fix version numbers should be confirmed directly via the Oracle CPU advisory before deploying patches in production.

Affected VersionsENISA

Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:26.0.2
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle GraalVM Enterprise Edition:21.3.19
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:25.0.4
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle GraalVM for JDK:21.0.12
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:21.0.12
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:8u501
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:17.0.20
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle GraalVM for JDK:17.0.20
Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition Oracle Java SE:11.0.32

Affects your stack

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Technical ContextAI · show details

The vulnerability resides in JSSE (Java Secure Socket Extension), Oracle's Java implementation of TLS/SSL protocols used for secure network communications. JSSE underpins virtually all TLS-enabled Java server-side applications including web services, REST APIs, and any application using javax.net.ssl or java.net.ssl APIs. The attack surface is the TLS handshake or data processing path reachable via network without authentication. Oracle has not assigned a CWE identifier, which limits root-cause classification; based on the partial DoS impact and the JSSE component context, the flaw is likely related to improper input validation or resource exhaustion during TLS record processing. Affected CPE covers Oracle Java SE 8u501, 11.0.32, 17.0.20, 21.0.12, 25.0.4, 26.0.2; GraalVM for JDK 17.0.20 and 21.0.12; and GraalVM Enterprise Edition 21.3.19. The note in the advisory explicitly excludes exploitation via Untrusted Java Web Start or applet contexts, confining attack surface to server-side applications exposing TLS endpoints.

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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 endpoint, no auth or interaction required, impact is partial availability only with no scope change.

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: 8u501, 11.0.32, 17.0.20, 21.0.12, 25.0.4, 26.0.2; Oracle GraalVM for JDK: 17.0.20 and 21.0.12; Oracle GraalVM Enterprise Edition: 21.3.19. 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 78% exploitable
Prevalence
Ubiquitous
Java SE powers the majority of enterprise server-side applications globally
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment 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
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

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 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:55774 ADVISORY https://access.redhat.com/errata/RHSA-2026:55775 ADVISORY https://access.redhat.com/errata/RHSA-2026:55776 ADVISORY https://access.redhat.com/errata/RHSA-2026:55777 ADVISORY https://access.redhat.com/errata/RHSA-2026:55778 ADVISORY https://access.redhat.com/errata/RHSA-2026:55779 ADVISORY https://access.redhat.com/errata/RHSA-2026:55780 ADVISORY https://access.redhat.com/errata/RHSA-2026:55781 ADVISORY https://access.redhat.com/errata/RHSA-2026:55782 ADVISORY https://access.redhat.com/errata/RHSA-2026:55783 ADVISORY https://access.redhat.com/errata/RHSA-2026:55787 ADVISORY https://access.redhat.com/errata/RHSA-2026:55788 ADVISORY https://access.redhat.com/errata/RHSA-2026:55789 ADVISORY https://access.redhat.com/errata/RHSA-2026:55798 ADVISORY https://access.redhat.com/errata/RHSA-2026:55799 ADVISORY https://access.redhat.com/errata/RHSA-2026:57175 ADVISORY https://access.redhat.com/errata/RHSA-2026:57177 ADVISORY https://access.redhat.com/errata/RHSA-2026:57765 ADVISORY https://access.redhat.com/errata/RHSA-2026:58266 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-70907 ADVISORY https://ubuntu.com/security/notices/USN-8795-1 ADVISORY https://ubuntu.com/security/notices/USN-8796-1 ADVISORY https://vuldb.com/vuln/392016 REF https://www.oracle.com/security-alerts/cspuaug2026.html

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