# RLSA-2026:0928: java-21-openjdk security update

RLSA-2026:0928, released January 23, 2026, fixes 5 CVEs in java-21-openjdk (version 1:21.0.10.0.7-1.el8). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rlsa-2026-0928
- Platform: Linux
- Released: Jan 23, 2026
- Priority: High (Closes CVE-2026-21945, high severity)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://errata.rockylinux.org/RLSA-2026:0928

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [java-21-openjdk](https://patchblox.com/security/data/product/linux/java-21-openjdk.md) | rocky 8 | 1:21.0.10.0.7-1.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-21945](https://patchblox.com/security/data/cve/CVE-2026-21945.md) | High | Java(TM) SE Development Kit 21 and 1 other: Uncontrolled Resource Consumption | 7.5 | 0.0099 |  |
| [CVE-2025-64720](https://patchblox.com/security/data/cve/CVE-2025-64720.md) | High | LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication | 7.5 | 0.0045 |  |
| [CVE-2026-21933](https://patchblox.com/security/data/cve/CVE-2026-21933.md) | High | Java(TM) SE Development Kit 21 and 1 other: Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product… | 7.5 | 0.0030 |  |
| [CVE-2025-65018](https://patchblox.com/security/data/cve/CVE-2025-65018.md) | High | LIBPNG is vulnerable to a heap buffer overflow in `png_combine_row` triggered via `png_image_finish_read` | 7.5 | 0.0028 |  |
| [CVE-2026-21925](https://patchblox.com/security/data/cve/CVE-2026-21925.md) | High | Java(TM) SE Development Kit 21 and 1 other: Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product… | 7.5 | 0.0025 |  |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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