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CVE-2026-83408 is a high-severity vulnerability in the Compiler component of Oracle GraalVM for JDK and Oracle GraalVM. Affected supported releases include Oracle GraalVM for JDK 17 23.0.13.1, Oracle GraalVM for JDK 21 23.1.12.1, and Oracle GraalVM 25.0.4.1. An unauthenticated attacker able to reach an affected installation via HTTP may compromise the product. The vulnerability has a CVSS v3.1 base score of 8.1 with vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
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What an attacker gets, and what they’ve been doing with it.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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A high-severity (CVSS 8.1) network-accessible vulnerability in the Compiler component of Oracle GraalVM for JDK and Oracle GraalVM. An unauthenticated attacker with HTTP network access could compromise and take over affected installations; exploitation is rated difficult.
A high-severity (CVSS 8.1) vulnerability in the Compiler component of Oracle GraalVM for JDK and Oracle GraalVM. An unauthenticated attacker with network access via HTTP may compromise and take over affected instances; exploitation is rated difficult due to high attack complexity.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.