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Fencer Vulns
low 3.7

CVE-2026-91409 json

Vulnerability in Oracle Java SE (component: Networking).

published 2026-10-20 19 d ago modified 2026-10-23 16 d ago also EUVD-2026-106661

cvss
3.7
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 32%
public exploits
0
none known

Summary

Vulnerability in Oracle Java SE (component: Networking). The supported version that is affected is Oracle Java SE: 27. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE. 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 3.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).

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-2026-91409 updated cvss 3.7

openjdk: Enhance QUIC connections (Oracle CPU 2026-10)

  • Red Hat build of OpenJDK 11 ELS java-11-openjdk, java-11-openjdk-windows, java-11-openjdk-portable Red Hat build of OpenJDK 17 java-17-openjdk-portable Red Hat build of OpenJDK 21 java-21-openjdk-windows, java-21-openjdk-portable Red Hat build of OpenJDK 25 java-25-openjdk-windows, java-25-openjdk-portable
    affected: no fix available
  • Red Hat Enterprise Linux 6 java-1.6.0-openjdk, java-1.7.0-openjdk, java-1.8.0-openjdk, java-1.6.0-openjdk-src, java-1.7.0-openjdk-src, java-1.8.0-openjdk-src, +7 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 java-1.6.0-openjdk, java-1.7.0-openjdk, java-1.8.0-openjdk, java-1.6.0-openjdk-src, java-1.7.0-openjdk-src, java-1.8.0-openjdk-src, +11 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 java-1.8.0-ibm, java-17-openjdk, java-21-openjdk, java-1.8.0-ibm-src, java-1.8.0-ibm-demo, java-1.8.0-ibm-jdbc, +45 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, java-21-ibm-semeru-certified-jdk
    affected: no fix available
  • Red Hat build of OpenJDK 1.8 java-1.8.0-openjdk-windows, java-1.8.0-openjdk-portable Red Hat build of OpenJDK 17 java-17-openjdk-windows Red Hat Enterprise Linux 8 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-fastdebug, +13 more Red Hat Hardened Images java-21-openjdk, java-25-openjdk, java-17-openjdk-portable, java-21-openjdk-portable, java-25-openjdk-portable
    not affected: vulnerable code not present

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
no
Technical impact
partial
Assessed
16 d ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Oracle Corporation Oracle Java SE

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.