Live › vulnerability › CVE-2026-83378
Go to dashboardA flaw in the Java SE Compiler component lets an unauthenticated attacker over the network read and modify a subset of data that Java SE can reach, by supplying crafted data to APIs such as through a web service. Exploitation is difficult, and the sources rate it CVSS 4.8 medium with no confidentiality or integrity loss beyond a subset of data.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Any service that runs Oracle Java SE 21.0.12.1, 25.0.4.1 or 27 and passes untrusted data into the affected compiler APIs, for example a web service. The sources say untrusted Java Web Start applications and applets are not needed for exploitation. Teams that run no Oracle Java SE builds in these versions can skip it.
No product ranges from the sources yet.
java -version and compare against the affected releases 21.0.12.1, 25.0.4.1 and 27.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Vulnerability in Oracle Java SE (component: Compiler). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE accessible data as well as unauthorized read access to a subset of Oracle Java SE accessible data. 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 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
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