Medium severity · published Oct 20, 2026
CVE-2026-87291
Vulnerability in Oracle Java SE (component: Networking)
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
Vulnerability in Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Java SE accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OJ
Oracle Java SE · Oracle Corporation
21.0.12.1; 25.0.4.1; 27 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87291
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87291
www.oracle.com
https://www.oracle.com/security-alerts/cpuoct2026.html
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