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CVE-2026-83374VulnerabilityPublished Updated

Red Hat Security Advisory: OpenJDK 17.0.21 Security Update for Portable Linux 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.

Data as of 29 Oct 2026, 07:15 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
EPSS
0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
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.

Description

The OpenJDK 17 packages provide the OpenJDK 17 Java Runtime Environment and the OpenJDK 17 Java Software Development Kit. This release of the Red Hat build of OpenJDK 17 (17.0.21) for portable Linux serves as a replacement for the Red Hat build of OpenJDK 17 (17.0.20 and 17.0.20.1) and includes security and bug fixes as well as enhancements. For further information, refer to the release notes linked to in the References section. Security Fix(es): * JDK: Enhance PKCS5 padding (CVE-2026-83374) * JDK: Enhance TLS certificate handling (CVE-2026-83376) * JDK: Enhance LDAP logins (CVE-2026-83380) * JDK: Enhance SASL Authentication (CVE-2026-83381) * JDK: Enhance WebRowSets (CVE-2026-83387) * JDK: Enhance HTTP Client Response Handling (CVE-2026-83395) * JDK: Enhance XML Processing (CVE-2026-83400) * JDK: Enhance XPath Expressions (CVE-2026-87290) * JDK: Enhance Network Clients (CVE-2026-87292) * JDK: Enhance Certificate Name Checks (CVE-2026-87294) * JDK: Enhance Template Handling (CVE-2026-87367) * JDK: Enhance HTTP Client (CVE-2026-91332) * JDK: Enhance JPEG loading (CVE-2026-91334) * JDK: Enhance Image Handling (CVE-2026-91335) * JDK: Enhance TLS handshakes (CVE-2026-91373) * JDK: Enhance jstatd (CVE-2026-91374) * JDK: Enhance jmod handling (CVE-2026-91375) * JDK: Enhance JShell (CVE-2026-91379) * JDK: Enhance Preferences (CVE-2026-91380) * JDK: Enhance Image Processing (CVE-2026-91382) * JDK: Enhance HTTP client caching (CVE-2026-91394) * JDK: Enhance diagnostic sessions (CVE-2026-91397) * JDK: Enhance SOCKS5 support (CVE-2026-91398) * JDK: Enhance MIDI file handling (CVE-2026-91400) * JDK: Enhance zipfs (CVE-2026-91410) * JDK: Enhance font rendering (CVE-2026-91415) * JDK: Enhance GIF loading (CVE-2026-91418) * JDK: Enhance HTTP server parsing (CVE-2026-91451) * JDK: Enhance HTTP server (CVE-2026-91452) * JDK: Improve HTTP headers (CVE-2026-91453) * JDK: Enhance TLS Extensions (CVE-2026-91461) * JDK: Enhance krb5 tokens (CVE-2026-91462) * JDK: Enhance krb5 client (CVE-2026-91463) * JDK: Enhance Kerberos validation (CVE-2026-91464) * JDK: Enhance C2 comparisons (CVE-2026-91487) * JDK: Enhance Certificate Constraint Checking (CVE-2026-101516) * JDK: Enhance Image Processing (CVE-2026-91382) * JDK: Distrust eMudhra intermediate CA certificates due to security concerns (CVE-2026-91403) 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

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