CVE-2024-20955 Information disclosure in GraalVM Enterprise Edition

Low 3.7 Published 16 Jan 2024 Updated 3 Jun 2025

An unauthenticated attacker can exploit a difficult-to-exploit vulnerability in Oracle GraalVM to gain unauthorized read access to a subset of accessible data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2024-20955?

CVE-2024-20955 is a low-severity vulnerability in Oracle Graalvm, published on 16 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Compiler). Supported versions that are affected are Oracle GraalVM for JDK: 17.0.9, 21.0.1; Oracle GraalVM Enterprise Edition: 20.3.12, 21.3.8 and 22.3.4. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. CVSS 3.1 Base Score 3.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Weakness: CWE-200

Which versions are affected by CVE-2024-20955?

It affects 2 products.

Products include Oracle Graalvm, Oracle Graalvm for Jdk.

How do I fix CVE-2024-20955?

Upgrade to a fixed version.

Is CVE-2024-20955 being exploited?

There is no known exploitation of CVE-2024-20955 in the wild and no public exploit code.

All Oracle Graalvm vulnerabilities

Sources

Also known as CLEANSTART-2026-NC06398, GHSA-qfqc-q85j-6m33.