Is CVE-2026-91332 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91332 being exploited in the wild.

How severe is CVE-2026-91332?

Medium severity, with a CVSS score of 5.3, published 20 October 2026.

Which products and versions are affected?

Oracle GraalVM Enterprise Edition 21.3.19.1.1; Oracle Graalvm For Jdk 17.0.20.1, 21.0.12.1; Oracle Java SE 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27.

Is there a fix for CVE-2026-91332?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-91332 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-91332?

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.

CVE-2026-91332: Oracle Java SE networking integrity bypass

CVE-2026-91332 · Severity: medium · CVSS 5.3 · Published 2026-10-20

Oracle Java SE contains a flaw in its networking component that allows an attacker to modify data processed by Java applications without authentication. This affects both desktop Java applications and web-based Java applets. An attacker with network access can alter sensitive information handled by Java applications, potentially leading to data corruption or unauthorized modifications in connected systems.

Technologies: Oracle GraalVM Enterprise Edition, Oracle Graalvm For Jdk, Oracle Java SE. Vendors: Oracle.

Quick answers

Is CVE-2026-91332 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91332 being exploited in the wild.
How severe is CVE-2026-91332?: Medium severity, with a CVSS score of 5.3, published 20 October 2026.
Which products and versions are affected?: Oracle GraalVM Enterprise Edition 21.3.19.1.1; Oracle Graalvm For Jdk 17.0.20.1, 21.0.12.1; Oracle Java SE 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27.
Is there a fix for CVE-2026-91332?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-91332 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-91332?: 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

The vulnerability exists in the Oracle Java SE networking component and is easily exploitable via network access without authentication or user interaction. Multiple protocols can be leveraged to exploit this issue through APIs in the affected component, such as web services consuming untrusted network data. Successful exploitation results in unauthorized modification of accessible data with integrity impact but no confidentiality or availability impact.

Affected products

Oracle Java SE 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27
Oracle GraalVM for JDK 17.0.20.1, 21.0.12.1
Oracle GraalVM Enterprise Edition 21.3.19.1.1

Timeline

2026-10-20: advisory: Oracle published CPU advisory

References

https://www.oracle.com/security-alerts/cpuoct2026.html

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