CVE-2026-21945
Description
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).
INFO
Published Date :
Jan. 20, 2026, 10:15 p.m.
Last Modified :
June 30, 2026, 3:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-21945
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Public PoC/Exploit Available at Github
CVE-2026-21945 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-21945.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-21945 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-21945
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
This project provides a simple example of Spring Boot CRUD application with Postgres DB, docker-compose and LGTM Observability support
docker docker-compose grafana jdbc lgtm-stack makefile postgres spring-boot
Makefile Shell Dockerfile Java
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-21945 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-21945 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/o:redhat:rhel_els:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux Server (v. 7 ELS)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk_els:11::el7'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenJDK 11 ELS for RHEL 7', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:rhel_els:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux Server Optional (v. 7 ELS)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk_els:11::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenJDK 11 ELS for RHEL 8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk_els:11::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenJDK 11 ELS for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.1'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_aus:8.2::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream AUS (v. 8.2)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_aus:8.4::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream AUS (v.8.4)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus_long_life:8.4::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_aus:8.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream AUS (v.8.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_e4s:8.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream E4S (v.8.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_tus:8.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream TUS (v.8.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_e4s:8.8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream E4S (v.8.8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_tus:8.8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream TUS (v.8.8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_e4s:9.0::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream E4S (v.9.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_e4s:9.2::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream E4S (v.9.2)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.4::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v.9.4)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:9::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.1'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::crb'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux CRB (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.4::crb'], 'vendor': 'Red Hat', 'product': 'Red Hat CodeReady Linux Builder EUS (v.9.4)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.6::crb'], 'vendor': 'Red Hat', 'product': 'Red Hat CodeReady Linux Builder EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:9::crb'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk_els:11'], 'vendor': 'Red Hat', 'product': 'OPENJDK ELS 11.0.30', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk:17'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of OpenJDK 17.0.18', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk:21'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of OpenJDK 21.0.10', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk:25'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of OpenJDK 25.0.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk:1.8'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of OpenJDK 8u482', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::supplementary'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux Supplementary (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openjdk:25'], 'vendor': 'Red Hat', 'product': 'Temurin Build of OpenJDK 25.0.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 10', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 6', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 7', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-295 Added Reference https://access.redhat.com/errata/RHSA-2026:0847 Added Reference https://access.redhat.com/errata/RHSA-2026:0848 Added Reference https://access.redhat.com/errata/RHSA-2026:0895 Added Reference https://access.redhat.com/errata/RHSA-2026:0897 Added Reference https://access.redhat.com/errata/RHSA-2026:0899 Added Reference https://access.redhat.com/errata/RHSA-2026:0901 Added Reference https://access.redhat.com/errata/RHSA-2026:0927 Added Reference https://access.redhat.com/errata/RHSA-2026:0928 Added Reference https://access.redhat.com/errata/RHSA-2026:0931 Added Reference https://access.redhat.com/errata/RHSA-2026:0932 Added Reference https://access.redhat.com/errata/RHSA-2026:0933 Added Reference https://access.redhat.com/errata/RHSA-2026:1606 Added Reference https://access.redhat.com/errata/RHSA-2026:4832 Added Reference https://access.redhat.com/security/cve/CVE-2026-21945 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2429927 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21945.json -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Oracle Corporation', 'product': 'Oracle Java SE', 'versions': [{'status': 'affected', 'version': '8u471'}, {'status': 'affected', 'version': '8u471-b50'}, {'status': 'affected', 'version': '8u471-perf'}, {'status': 'affected', 'version': '11.0.29'}, {'status': 'affected', 'version': '17.0.17'}, {'status': 'affected', 'version': '21.0.9'}, {'status': 'affected', 'version': '25.0.1'}]}, {'vendor': 'Oracle Corporation', 'product': 'Oracle GraalVM for JDK', 'versions': [{'status': 'affected', 'version': '17.0.17'}, {'status': 'affected', 'version': '21.0.9'}]}, {'vendor': 'Oracle Corporation', 'product': 'Oracle GraalVM Enterprise Edition', 'versions': [{'status': 'affected', 'version': '21.3.16'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-21945', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-01-21T15:04:39.899042Z'} -
CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Siemens', 'product': 'SIMATIC CN 4100', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': 'V5.0', 'versionType': 'custom'}], 'defaultStatus': 'unknown'}] -
CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
May. 12, 2026
Action Type Old Value New Value Added Reference https://cert-portal.siemens.com/productcert/html/ssa-032379.html -
Initial Analysis by [email protected]
Jan. 30, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:oracle:jdk:1.8.0:update471_b50:*:*:-:*:*:* *cpe:2.3:a:oracle:jdk:11.0.29:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jdk:17.0.17:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jdk:21.0.9:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jdk:25.0.1:*:*:*:*:*:*:* *cpe:2.3:a:oracle:graalvm:21.3.16:*:*:*:enterprise:*:*:* *cpe:2.3:a:oracle:graalvm_for_jdk:21.0.9:*:*:*:*:*:*:* *cpe:2.3:a:oracle:graalvm_for_jdk:17.0.17:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jre:1.8.0:update471_b50:*:*:-:*:*:* *cpe:2.3:a:oracle:jre:11.0.29:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jre:17.0.17:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jre:21.0.9:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jre:25.0.1:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jdk:1.8.0:update471:*:*:-:*:*:* *cpe:2.3:a:oracle:jdk:1.8.0:update471:*:*:enterprise_performance_pack:*:*:* *cpe:2.3:a:oracle:jre:1.8.0:update471:*:*:-:*:*:* *cpe:2.3:a:oracle:jre:1.8.0:update471:*:*:enterprise_performance_pack:*:*:* Added Reference Type Oracle: https://www.oracle.com/security-alerts/cpujan2026.html Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 21, 2026
Action Type Old Value New Value Added CWE CWE-400 -
New CVE Received by [email protected]
Jan. 20, 2026
Action Type Old Value New Value Added Description 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). Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added Reference https://www.oracle.com/security-alerts/cpujan2026.html