# CVE-2026-34282: Oracle Java SE and GraalVM denial of service in Networking component

Source: https://junglewise.ai/threats/cve-2026-34282-oracle-java-se-and-graalvm-denial-of-service-in-networking  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-21. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-34282 · Severity: high · CVSS 7.5 · Published 2026-04-21

A vulnerability exists in the networking component of Oracle Java and GraalVM, which are widely used platforms for running enterprise applications and web services. An attacker can exploit this flaw over a network to cause the application to hang or crash repeatedly, leading to a complete denial of service. This could disrupt business operations, take critical web services offline, and impact the availability of customer-facing applications.

Technologies: [Oracle GraalVM Enterprise Edition](https://junglewise.ai/threats/technologies/graalvm-enterprise-edition), [Oracle Graalvm For Jdk](https://junglewise.ai/threats/technologies/graalvm-for-jdk), [Oracle Java SE](https://junglewise.ai/threats/technologies/java-se). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-34282 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34282 being exploited in the wild.

**How severe is CVE-2026-34282?** High severity, with a CVSS score of 7.5, published 21 April 2026.

**Which products and versions are affected?** Oracle GraalVM Enterprise Edition 21.3.17; Oracle Graalvm For Jdk 17.0.18, 21.0.10; Oracle Java SE 8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26.

**Is there a fix for CVE-2026-34282?** A patch was published on 2026-04-28: Red Hat released security updates for hardened images Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34282 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-34282?** Check whether you run Oracle GraalVM Enterprise Edition, Oracle Graalvm For Jdk or Oracle Java SE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is classified as an uncontrolled resource consumption or infinite loop (CWE-400, CWE-835) within the Networking component of the Java runtime. It is easily exploitable by an unauthenticated attacker with network access via multiple protocols, typically by providing malicious data to APIs used by web services or sandboxed applications (Java Web Start/applets). A successful exploit results in a complete denial of service (DoS) by causing the JVM to hang or crash. The issue affects various versions of Oracle Java SE, GraalVM, and Red Hat OpenJDK, and has been addressed in subsequent CPU (Critical Patch Update) releases such as OpenJDK 25.0.3.

## Affected products

- Oracle Java SE 8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26
- Oracle GraalVM for JDK 17.0.18, 21.0.10
- Oracle GraalVM Enterprise Edition 21.3.17
- Red Hat OpenJDK 11, 21, 25.0.2

## Timeline

- 2026-04-21: advisory: Initial disclosure by Oracle/NVD
- 2026-04-28: patched: Red Hat released security updates for hardened images
- 2026-04-30: patched: Red Hat released OpenJDK 25.0.3 security update for Windows

## References

- [https://www.oracle.com/security-alerts/cpuapr2026.html](https://www.oracle.com/security-alerts/cpuapr2026.html)
- [https://access.redhat.com/errata/RHSA-2026:11403](https://access.redhat.com/errata/RHSA-2026:11403)
- [https://access.redhat.com/errata/RHSA-2026:11655](https://access.redhat.com/errata/RHSA-2026:11655)
- [https://access.redhat.com/errata/RHSA-2026:11822](https://access.redhat.com/errata/RHSA-2026:11822)
- [https://access.redhat.com/errata/RHSA-2026:11829](https://access.redhat.com/errata/RHSA-2026:11829)
- [https://access.redhat.com/errata/RHSA-2026:11902](https://access.redhat.com/errata/RHSA-2026:11902)
- [https://access.redhat.com/errata/RHSA-2026:22328](https://access.redhat.com/errata/RHSA-2026:22328)

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