Skip to content
Fencer Vulns
critical 9.1

CVE-2026-91403 json

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE).

published 2026-10-21 18 d ago modified 2026-10-24 15 d ago also EUVD-2026-107578

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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).

Patch / fix

  • openjdk-21 Debian 13 21.0.13+9-1~deb13u2
  • openjdk-21 Debian 14 21.0.13+9-1
  • openjdk-25 Debian 13 25.0.5+8-1~deb13u1
  • openjdk-25 Debian 14 25.0.5+8-1

debian advisories DEBIAN-CVE-2026-91403

  • java-21-openj9 openSUSE Tumbleweed 21.0.13.0-1.1
  • java-11-openjdk openSUSE Tumbleweed 11.0.33.0-1.1
  • java-21-openjdk openSUSE Tumbleweed 21.0.13.0-1.1
  • java-25-openjdk openSUSE Tumbleweed 25.0.5.0-1.1
  • java-17-openjdk openSUSE Tumbleweed 17.0.21.0-1.1

opensuse advisories openSUSE-SU-2026:12435-1openSUSE-SU-2026:12418-1openSUSE-SU-2026:12328-1openSUSE-SU-2026:12329-1openSUSE-SU-2026:12294-1

  • java-21-openjdk AlmaLinux 8 1:21.0.13.0.9-1.1.el8
  • java-21-openjdk AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-src AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-demo AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-jmods AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-javadoc AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-headless AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1
  • java-21-openjdk-fastdebug AlmaLinux 9 1:21.0.13.0.9-1.2.el9.alma.1

almalinux advisories ALSA-2026:88349ALSA-2026:90500ALSA-2026:90504ALSA-2026:88347ALSA-2026:88352

  • openjdk17 Alpine 3.24, Alpine 3.23 17.0.21.0.3_p1-r0
  • openjdk21 Alpine 3.24, Alpine 3.23 21.0.13.0.3_p1-r0
  • openjdk25 Alpine 3.24, Alpine 3.23 25.0.5.0.3_p1-r0

alpine advisories ALPINE-CVE-2026-91403

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-91403 updated cvss 6.8

OpenJDK: Distrust eMudhra intermediate CA certificates due to security concerns

  • Red Hat Exploit Intelligence exploit-intelligence/vulnerability-analysis-rhel9 Red Hat build of OpenJDK 1.8 java-openjdk.win.jdk.x86_64.zip, java-openjdk-portable.portable.jdk.el.x86_64.tar.xz Red Hat build of OpenJDK 11 ELS java-11-openjdk
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 java-1.8.0-openjdk, java-1.8.0-openjdk-src, java-1.8.0-openjdk-demo, java-1.8.0-openjdk-javadoc, java-1.8.0-openjdk-headless
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 java-1.8.0-openjdk, java-1.8.0-openjdk-src, java-1.8.0-openjdk-demo, java-1.8.0-openjdk-javadoc, java-1.8.0-openjdk-headless, java-1.8.0-openjdk-javadoc-zip, +1 more Red Hat Enterprise Linux 8 java-17-openjdk, java-21-openjdk, java-1.8.0-openjdk, java-17-openjdk-src, java-21-openjdk-src, java-17-openjdk-demo, +57 more Red Hat Enterprise Linux 9 java-17-openjdk, java-21-openjdk, java-25-openjdk, java-1.8.0-openjdk, java-17-openjdk-src, java-21-openjdk-src, +79 more Red Hat Enterprise Linux 10 java-21-openjdk, java-25-openjdk
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Hardened Images java-25-openjdk, java-17-openjdk-portable 17.0.20.0.8-0.1.hum1 Red Hat OpenShift AI (RHOAI) rhoai/odh-modelmesh-rhel9, rhoai/odh-spark-operator-rhel9, rhoai/odh-trustyai-service-rhel9, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9, +14 more
    affected: workaround, no fix available
  • Red Hat OPENJDK ELS 11.0.33
    fixed: vendor fix RHSA-2026:95273
  • Red Hat Build of OpenJDK 17.0.20.1
    fixed: vendor fix RHSA-2026:89916
  • Red Hat Build of OpenJDK 17.0.21
    fixed: vendor fix RHSA-2026:88353
  • Red Hat Build of OpenJDK 21.0.12.1
    fixed: vendor fix RHSA-2026:88350
show 4 more
  • Red Hat Build of OpenJDK 21.0.13
    fixed: vendor fix RHSA-2026:88351
  • Red Hat Build of OpenJDK 25.0.5
    fixed: vendor fix RHSA-2026:88348
  • Red Hat Hardened Images java-21-openjdk 21.0.13.0.9-0.1.hum1, java-21-openjdk-src 21.0.13.0.9-0.1.hum1, java-21-openjdk-demo 21.0.13.0.9-0.1.hum1, java-21-openjdk-jmods 21.0.13.0.9-0.1.hum1, java-21-openjdk-javadoc 21.0.13.0.9-0.1.hum1, java-25-openjdk-portable 25.0.5.0.8-3.0.hum1, +36 more
    fixed: vendor fix RHSA-2026:94403
  • Red Hat Temurin Build of OpenJDK 25.0.4.1
    fixed: vendor fix RHSA-2026:90912

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
16 d ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Oracle Corporation Oracle Java SE
  • Oracle Corporation Oracle GraalVM for JDK
  • Oracle Corporation Oracle GraalVM Enterprise Edition

Classification

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

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.