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CVE-2026-91403

CRITICAL 9.1

Published 2026-10-21 · Last modified 2026-10-24

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; Oracle GraalVM for JDK: 17.0.21 and 21.0.13; Oracle GraalVM Enterprise Edition: 21.3.20. 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 of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized access to critical data or complete access to all 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 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

ELEVATED IMPACT

Severe if exploited (CVSS 9.1), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 24th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

9.1CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Oracle Corporation

Products Oracle Java Se Oracle Graalvm For Jdk Oracle Graalvm Enterprise Edition

Weakness (CWE)

  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References and research data (JSON)

Vendor product assessments

Showing 32 of 257 vendor product statements; 225 omitted. Read the full vendor advisory.

  • java-openjdk.win.jdk.x86_64.zip as a component of Red Hat build of OpenJDK 1.8 · known affected

    Vendor assessment for this product only.

    pkg:generic/java-openjdk.win.jdk.x86_64.zip

    • none available: Affected
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk.portable.jdk.x86_64.tar.xz as a component of Red Hat build of OpenJDK 25 · known affected

    Vendor assessment for this product only.

    pkg:generic/java-25-openjdk.portable.jdk.x86_64.tar.xz

    • none available: Affected
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-headless as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-headless

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-slowdebug as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-devel-fastdebug as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-devel-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-jmods-fastdebug as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-jmods-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-static-libs-slowdebug as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-static-libs-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-headless as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-headless

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-accessibility as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-accessibility

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-javadoc as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-javadoc

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-accessibility as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-accessibility

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-devel-slowdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-devel-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-src as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-src

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-devel-fastdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-devel-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-jmods as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-jmods

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-static-libs-fastdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-static-libs-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-devel-fastdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-devel-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-jmods-fastdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-jmods-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-static-libs-slowdebug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-static-libs-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-devel-slowdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-devel-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-1.8.0-openjdk-src as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-1.8.0-openjdk-src

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-devel-fastdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-devel-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-jmods as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-jmods

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-17-openjdk-static-libs-fastdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-17-openjdk-static-libs-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-devel-fastdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-devel-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-jmods-fastdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-jmods-fastdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-21-openjdk-static-libs-slowdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-21-openjdk-static-libs-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-demo-slowdebug as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-demo-slowdebug

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-javadoc as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-javadoc

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk-static-libs as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk-static-libs

    • none available: Fix deferred
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00
  • java-25-openjdk.src as a component of Red Hat Hardened Images · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/java-25-openjdk?arch=src

    • none available: Affected
    Red Hat · CVE-2026-91403 · Updated 2026-10-23T16:43:05+00:00

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

4 candidates

All CVSS metrics

  • CRITICAL 9.1 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  • CRITICAL 9.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS