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Oracle Java SE CVE-2026-22013

| EUVDEUVD-2026-24321 MEDIUM
Protection Mechanism Failure (CWE-693)
2026-04-21 oracle GHSA-75hh-423h-rvwg
Authentication Bypass Java Oracle Oracle Java Se Oracle Graalvm Enterprise Edition Oracle Graalvm For Jdk Oracle Corporation
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
vuln.today AI
5.3 MEDIUM

Network delivery requires victim interaction and specific sandboxed-client conditions (AC:H, UI:R); no privileges needed; confidentiality-only impact with no integrity or availability consequence.

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Analysis Generated
Jul 24, 2026 - 06:34 vuln.today
Patch released
Apr 28, 2026 - 08:30 nvd
Patch available
EUVD ID Assigned
Apr 21, 2026 - 21:01 euvd
EUVD-2026-24321
CVE Published
Apr 21, 2026 - 20:35 nvd
MEDIUM 5.3

DescriptionCVE.org

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). Supported versions that are affected are Oracle Java SE: 8u481, 8u481-b50, 8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26; Oracle GraalVM for JDK: 17.0.18 and 21.0.10; Oracle GraalVM Enterprise Edition: 21.3.17. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).

AnalysisAI

Unauthorized full data disclosure in Oracle Java SE's JGSS component allows unauthenticated remote attackers to read all data accessible by the Java runtime, but only against sandboxed client deployments running untrusted code such as Java Web Start applications or applets. Affected releases span Oracle Java SE 8u481 through 26, GraalVM for JDK 17.0.18 and 21.0.10, and GraalVM Enterprise Edition 21.3.17. No active exploitation is confirmed - EPSS sits at 0.03% (9th percentile) and CISA has not listed this in KEV - but the confidentiality impact is rated high when exploitation conditions are met.

Technical ContextAI

JGSS (Java Generic Security Services) is the Java implementation of the IETF GSS-API framework, providing a unified interface for security mechanisms including Kerberos authentication and message-level security. CWE-693 (Protection Mechanism Failure) identifies the root cause: the Java sandbox boundary that is supposed to isolate untrusted code fails to prevent that code from leveraging the JGSS subsystem to access sensitive data. CPE strings confirm three distinct product lines are affected - cpe:2.3:a:oracle_corporation:oracle_java_se, cpe:2.3:a:oracle_corporation:oracle_graalvm_for_jdk, and cpe:2.3:a:oracle_corporation:oracle_graalvm_enterprise_edition - all under Oracle's Java SE product family. The flaw is scoped entirely to client-side runtimes that enforce sandbox boundaries, not server-side JVMs running trusted administrator-installed code.

RemediationAI

Apply Oracle's April 2026 Critical Patch Update, available at https://www.oracle.com/security-alerts/cpuapr2026.html, which provides patched builds for all affected Java SE and GraalVM releases. Exact patched version numbers beyond the CPU cycle are not independently confirmed in the available data - consult the Oracle advisory for specific build identifiers. Red Hat Enterprise Linux users should apply the applicable RHSA advisories (RHSA-2026:9255, RHSA-2026:9256, and RHSA-2026:9682 through RHSA-2026:9694) via standard package management. SUSE users should apply available patches per their security notices. As a targeted compensating control that eliminates the attack surface entirely: disable or remove Java Web Start (javaws) and browser applet support on any Java 8 client systems that cannot be patched immediately, since this vulnerability does not apply to server-side deployments running only trusted code. Restricting end-user systems from loading Java content from untrusted internet sources via network policy or application allowlisting would also prevent exploitation.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-22013 vulnerability details – vuln.today
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