# CVE-2026-83408 — Oracle GraalVM for JDK, Oracle GraalVM

> As of 2026-09-15, CVE-2026-83408 is a HIGH-severity vulnerability in Oracle GraalVM for JDK, Oracle GraalVM, CVSS v3.1 8.1, EPSS 0.3% (23.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-83408 as of 2026-09-15; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-15

## What is CVE-2026-83408?

Vulnerability in the Oracle GraalVM for JDK, Oracle GraalVM product of Oracle Java SE (component: Compiler). The supported version that is affected is Oracle GraalVM for JDK 17: 23.0.13.1; Oracle GraalVM for JDK 21: 23.1.12.1; Oracle GraalVM: 25.0.4.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle GraalVM for JDK, Oracle GraalVM. Successful attacks of this vulnerability can result in takeover of Oracle GraalVM for JDK, Oracle GraalVM. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 20 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.1 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-15

## Is CVE-2026-83408 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Oracle Corporation](https://intel.threadlinqs.com/vendors/oracle): Oracle GraalVM for JDK, Oracle GraalVM

## How to fix CVE-2026-83408

No vendor patch reference has been recorded for CVE-2026-83408 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-83408

No threat campaign in the Threadlinqs corpus currently references CVE-2026-83408, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-16.

**Vendor advisory and patch**

- [oracle.com — vendor advisory](https://www.oracle.com/security-alerts/cspusep2026.html)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-83408
Full detection coverage and IOCs for threats exploiting CVE-2026-83408 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp