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CVE-2026-83374VulnerabilityPublished

Red Hat Security Advisory: OpenJDK 21.0.13 Security Update for Portable Linux Builds

Affects Red Hat OpenJDK 21.0.13Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-83374· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium.

Data as of 29 Oct 2026, 17:23 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (oracle)CVSS 3.15.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Oracle CorporationOracle Java SEAffected
  • 8u503 – 27
7 affected builds
Fixed in–
Oracle CorporationOracle GraalVM for JDKAffected
  • =17.0.20.1
  • =21.0.12.1
Fixed in–
Oracle CorporationOracle GraalVM Enterprise EditionAffected
  • =21.3.19.1.1
Fixed in–
Mavencom.oracle.java/java-sepkg:maven/com.oracle.java/java-seOther threatsAffected
  • 8u503 – 27
8 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update to OpenJDK 21 (version 21.0.13) is available from Red Hat and should be applied to replace versions 21.0.12 and 21.0.12.1. Users should ensure that all previously released errata relevant to their system have been applied before updating. The update includes fixes for all listed vulnerabilities and distrusts problematic intermediate CA certificates. No additional mitigation steps are indicated beyond applying this official update.

Description

Red Hat has released a critical security update for OpenJDK 21 (version 21.0.13) for portable Linux builds. This update replaces versions 21.0.12 and 21.0.12.1 and includes numerous security enhancements and bug fixes addressing multiple vulnerabilities across various components such as PKCS5 padding, TLS certificate handling, LDAP logins, HTTP client and server, XML processing, Kerberos validation, and more. The update also distrusts certain intermediate CA certificates due to security concerns. Users of affected OpenJDK 21 builds are advised to apply this update to mitigate these critical security issues.

References

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