CVE-2026-21945

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Published: 2026-01-20 Last update: 2026-05-12 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-21945 is rated Low Risk (35.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-21945

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-21 0.05% 0.05% +0.00%
2 2026-01-31 0.05% 0.05% -0.00%
3 2026-01-26 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-21945

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-21945

GitHub Security Advisory for CVE-2026-21945

GHSA-r2mr-x4h2-9chr · Severity: high — Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition...

OS Trackers for CVE-2026-21945

vendor priority summary link
alpine — CVE-2026-21945: 3 source package rows (openjdk11, openjdk17, openjdk21); 6 state rows across 2 repos (3.23-community, edge-community); fixed 6, open 0. https://security.alpinelinux.org/vuln/CVE-2026-21945
debian not yet assigned CVE-2026-21945 not yet assigned priority: Debian including 5 source packages (openjdk-11, openjdk-17, openjdk-21, openjdk-25, openjdk-8), 12 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 12. https://security-tracker.debian.org/tracker/CVE-2026-21945
redhat high — https://access.redhat.com/security/cve/CVE-2026-21945
suse high — https://www.suse.com/security/cve/CVE-2026-21945/
ubuntu medium CVE-2026-21945 medium priority: Ubuntu including 12 source packages (openjdk-13, openjdk-16, …), 59 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): released 34, DNE 17, ignored 4, needs-triage 4. https://ubuntu.com/security/CVE-2026-21945

Affected software / configurations for CVE-2026-21945

Vendor Product Version Raw CPE
oracle graalvm 21.3.16 cpe:2.3:a:oracle:graalvm:21.3.16:*:*:*:enterprise:*:*:*
oracle graalvm_for_jdk 17.0.17 cpe:2.3:a:oracle:graalvm_for_jdk:17.0.17:*:*:*:*:*:*:*
oracle graalvm_for_jdk 21.0.9 cpe:2.3:a:oracle:graalvm_for_jdk:21.0.9:*:*:*:*:*:*:*
oracle jdk 1.8.0 cpe:2.3:a:oracle:jdk:1.8.0:update471:*:*:-:*:*:*
oracle jdk 1.8.0 cpe:2.3:a:oracle:jdk:1.8.0:update471:*:*:enterprise_performance_pack:*:*:*
oracle jdk 1.8.0 cpe:2.3:a:oracle:jdk:1.8.0:update471_b50:*:*:-:*:*:*
oracle jdk 11.0.29 cpe:2.3:a:oracle:jdk:11.0.29:*:*:*:*:*:*:*
oracle jdk 17.0.17 cpe:2.3:a:oracle:jdk:17.0.17:*:*:*:*:*:*:*
oracle jdk 21.0.9 cpe:2.3:a:oracle:jdk:21.0.9:*:*:*:*:*:*:*
oracle jdk 25.0.1 cpe:2.3:a:oracle:jdk:25.0.1:*:*:*:*:*:*:*
oracle jre 1.8.0 cpe:2.3:a:oracle:jre:1.8.0:update471:*:*:-:*:*:*
oracle jre 1.8.0 cpe:2.3:a:oracle:jre:1.8.0:update471:*:*:enterprise_performance_pack:*:*:*
oracle jre 1.8.0 cpe:2.3:a:oracle:jre:1.8.0:update471_b50:*:*:-:*:*:*
oracle jre 11.0.29 cpe:2.3:a:oracle:jre:11.0.29:*:*:*:*:*:*:*
oracle jre 17.0.17 cpe:2.3:a:oracle:jre:17.0.17:*:*:*:*:*:*:*
oracle jre 21.0.9 cpe:2.3:a:oracle:jre:21.0.9:*:*:*:*:*:*:*
oracle jre 25.0.1 cpe:2.3:a:oracle:jre:25.0.1:*:*:*:*:*:*:*

References for CVE-2026-21945

cvelogic Threat Intelligence