Red Hat Security Advisory: OpenJDK 21.0.9 Security Update for Windows Builds
Affects Red Hat OpenJDK 21.0.9Source GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 5.9 Medium.
Data as of 5 Nov 2026, 17:34 UTC
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 21 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Mavencom.oracle.java/sepkg:maven/com.oracle.java/seOther threats | Affected
| Fixed in– |
Mavencom.oracle.graalvm/graalvm-jdkpkg:maven/com.oracle.graalvm/graalvm-jdkOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The OpenJDK 21 packages provide the OpenJDK 21 Java Runtime Environment and the OpenJDK 21 Java Software Development Kit. This release of the Red Hat build of OpenJDK 21 (21.0.9) for Windows serves as a replacement for the Red Hat build of OpenJDK 21 (21.0.8) and includes security and bug fixes. For further information, refer to the release notes linked to in the References section. Security Fix(es): * JDK: Enhance Path Factories (CVE-2025-53066) * JDK: Enhance Certificate Handling (CVE-2025-53057) * JDK: Enhance String Handling (CVE-2025-61748) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
- access.redhat.com/errata/RHSA-2025:18826 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- docs.redhat.com/en/documentation/red_hat_build_of_openjdk/21/html/release_notes_for_red_hat_build_of_openjdk_21.0.9/index (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_18826.json (opens in a new tab)