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CVE-2026-83374VulnerabilityPublished Updated

Red Hat Security Advisory: OpenJDK 17.0.21 Security Update for Windows Builds

Affects Red Hat OpenJDK 17.0.21Source 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 · fixed in Red Hat package updates : update Red Hat java-se when convenient.

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
Patch
Available – fixed in 17.0.21
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

Users of the Red Hat build of OpenJDK 17 on Windows should update to version 17.0.21, which includes fixes for all listed vulnerabilities. Before applying this update, ensure that all previously released errata relevant to your system have been applied. Refer to Red Hat's official update instructions at https://access.redhat.com/articles/11258 for detailed guidance on applying this security update.

Description

Red Hat has released a security update for its OpenJDK 17 build for Windows (version 17.0.21) that addresses multiple security vulnerabilities. This update replaces versions 17.0.20 and 17.0.20.1 and includes numerous enhancements and fixes related to cryptographic padding, TLS certificate handling, LDAP logins, SASL authentication, HTTP client and server handling, XML processing, image handling, Kerberos validation, and distrust of certain intermediate CA certificates. The update is rated critical by Red Hat Product Security.

References

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