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CVE-2026-21933 Oracle Java SE

Affected softwareOracle Java SE
Affected versionsOracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17, 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16
Severity6.1 Medium CVSS 3.1
Fixed inOracle Critical Patch Update January 2026
Published20 Jan 2026
Updated17 Jun 2026

Description

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 6.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.30% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2429926 : a Red Hat bug: the triage, which links onward to the fix

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update January 2026 ↗ CPU 2026-Q1 Oracle Java SE / Networking (Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17, 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16)
Oracle's note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security.

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Java SE Networking Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17, 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16 8.0.471.0 · 8.0.471.50 · 11.0.29.0 · 17.0.17.0 · 21.0.9.0 · 21.3.16.0 · 25.0.1.0

Products and versions

4 products, 15 version entries
SourceVendorProductSchemeAffected versions
nvd oracle graalvm javase 21.3.16
nvd oracle graalvm for jdk javase 17.0.17 · 21.0.9
nvd oracle jdk javase 1.8.0:update471 · 1.8.0:update471_b50 · 11.0.29 · 17.0.17 · 21.0.9 · 25.0.1
nvd oracle jre javase 1.8.0:update471 · 1.8.0:update471_b50 · 11.0.29 · 17.0.17 · 21.0.9 · 25.0.1

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2429926 bugzilla
https://access.redhat.com/errata/RHSA-2026:0847 ADVISORY, RHSA-2026:0847
https://access.redhat.com/security/cve/CVE-2026-21933 REPORT, RHSA-2026:0847
https://access.redhat.com/errata/RHSA-2026:0927 ADVISORY, RHSA-2026:0927
https://access.redhat.com/errata/RHSA-2026:0928 ADVISORY, RHSA-2026:0928
https://access.redhat.com/errata/RHSA-2026:0931 ADVISORY, RHSA-2026:0931
https://access.redhat.com/errata/RHSA-2026:0932 ADVISORY, RHSA-2026:0932
https://access.redhat.com/errata/RHSA-2026:0933 ADVISORY, RHSA-2026:0933
https://access.redhat.com/errata/RHSA-2026:4832 ADVISORY, RHSA-2026:4832
https://www.oracle.com/security-alerts/cpujan2026.html Vendor Advisory

Timeline

Published2026-01-20By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.