Red Hat Security Advisory: java-21-openjdk security update for RHEL 8 and 9
Affects Red Hat java-21-openjdkSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 5.9 Medium.
Data as of 30 Oct 2026, 09:50 UTC
Thin evidence
One scorer or none| CNA (oracle) | CVSS 3.1 | 5.9 |
|---|
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 20 Oct 2026
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 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Oracle CorporationOracle Java SE | Affected
| Fixed in– |
| Oracle CorporationOracle GraalVM for JDK | Affected
| Fixed in– |
| Oracle CorporationOracle GraalVM Enterprise Edition | Affected
| Fixed in– |
Mavencom.oracle.java/java-sepkg:maven/com.oracle.java/java-seOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released an official security update for java-21-openjdk packages on Red Hat Enterprise Linux 8 and 9. Users should apply this update promptly to remediate the listed vulnerabilities. Before applying this update, ensure all previously released errata relevant to your system have been applied. For detailed update instructions, refer to Red Hat's official documentation at https://access.redhat.com/articles/11258. Additionally, update the ca-certificates package to address related certificate store vulnerabilities.
Description
Red Hat has released a security update for the java-21-openjdk packages in Red Hat Enterprise Linux 8 and 9. This update addresses multiple security vulnerabilities across various components of the OpenJDK 21 Java Runtime Environment and Software Development Kit, including enhancements to PKCS5 padding, TLS certificate handling, LDAP logins, SASL authentication, HTTP client and server handling, XML processing, and more. The update is rated as Important by Red Hat Product Security. Users should apply this update to mitigate the addressed vulnerabilities.
References
- access.redhat.com/errata/RHSA-2026:88349 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556709 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556795 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556824 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556837 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556859 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2556960 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557007 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557032 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557041 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557047 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557056 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557079 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557110 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557117 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557122 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557195 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557236 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2557261 (opens in a new tab)