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CVE-2026-91403

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: 8u

Oracle Corporation Oracle Java SERuntimes & languages
CVSS
9.1Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.39%Chance of exploitation activity in the next 30 days, higher than 32% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 21 Oct 2026, 21:23 UTCPublishedCVE List
  2. 23 Oct 2026, 20:07 UTCExploit code publicGitHub proof-of-concept repositories

Reports 2

2 outlets mention it. Reports are not confirmation; each links to its source.

Description

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).

Text from CVE List

Affected versions 10

  • Oracle Java SEaffected: 8u511CVE List
  • Oracle Java SEaffected: 8u511-perfCVE List
  • Oracle Java SEaffected: 11.0.33CVE List
  • Oracle Java SEaffected: 17.0.21CVE List
  • Oracle Java SEaffected: 21.0.13CVE List
  • Oracle Java SEaffected: 25.0.5CVE List
  • Oracle Java SEaffected: 27.0.1CVE List
  • Oracle GraalVM for JDKaffected: 17.0.21CVE List
  • Oracle GraalVM for JDKaffected: 21.0.13CVE List
  • Oracle GraalVM Enterprise Editionaffected: 21.3.20CVE List

References 1