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JDK 15.0.1 Release Notes

Java Development Kit 15 Release Notes

Java™ SE Development Kit 15.0.1 (JDK 15.0.1)

October 20, 2020

The full version string for this update release is 15.0.1+9 (where "+" means "build"). The version number is 15.0.1.

IANA Data 2020a

JDK 15.0.1 contains IANA time zone data version 2020a. For more information, refer to Timezone Data Versions in the JRE Software.

Security Baselines

The security baselines for the Java Runtime Environment (JRE) at the time of the release of JDK 15.0.1 are specified in the following table:

JRE Family Version JRE Security Baseline (Full Version String)
15 15.0.1+9
11 11.0.9+7
8 1.8.0_271-b09
7 1.7.0_281-b06

Keeping the JDK up to Date

Oracle recommends that the JDK is updated with each Critical Patch Update (CPU). In order to determine if a release is the latest, the Security Baseline page can be used to determine which is the latest version for each release family.

Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Bulletins. It is not recommended that this JDK (version 15.0.1) be used after the next critical patch update scheduled for January 19, 2021.

New Features

 Improve Certificate Chain Handling

A new system property, jdk.tls.maxHandshakeMessageSize, has been added to set the maximum allowed size for the handshake message in TLS/DTLS handshaking. The default value of the system property is 32768 (32 kilobytes).

A new system property, jdk.tls.maxCertificateChainLength, has been added to set the maximum allowed length of the certificate chain in TLS/DTLS handshaking. The default value of the system property is 10.

JDK-8245417 (not public)

Other notes

 Added Property to Control LDAP Authentication Mechanisms Allowed to Authenticate Over Clear Connections

A new environment property, jdk.jndi.ldap.mechsAllowedToSendCredentials, has been added to control which LDAP authentication mechanisms are allowed to send credentials over clear LDAP connections - a connection not secured with TLS. An encrypted LDAP connection is a connection opened by using ldaps scheme, or a connection opened by using ldap scheme and then upgraded to TLS with a STARTTLS extended operation.

The value of the property, which is by default not set, is a comma separated list of the mechanism names that are permitted to authenticate over a clear connection. If a value is not specified for the property, then all mechanisms are allowed. If the specified value is an empty list, then no mechanisms are allowed (except for none and anonymous). The default value for this property is 'null' ( i.e. System.getProperty("jdk.jndi.ldap.mechsAllowedToSendCredentials") returns 'null'). To explicitly permit all mechanisms to authenticate over a clear connection, the property value can be set to "all". If a connection is downgraded from encrypted to clear, then only the mechanisms that are explicitly permitted are allowed.

The property can be supplied to the LDAP context environment map, or set globally as a system property. When both are supplied, the environment map takes precedence.

Note: none and anonymous authentication mechanisms are exempted from these rules and are always allowed regardless of the property value.

JDK-8237990 (not public)

 Added 3 SSL Corporation Root CA Certificates

The following root certificates have been added to the cacerts truststore:

+ SSL Corporation
  + sslrootrsaca
    DN: Root Certification Authority RSA, O=SSL Corporation, L=Houston, ST=Texas, C=US

  + sslrootevrsaca
    DN: EV Root Certification Authority RSA R2, O=SSL Corporation, L=Houston, ST=Texas, C=US

  + sslrooteccca
    DN: Root Certification Authority ECC, O=SSL Corporation, L=Houston, ST=Texas, C=US
See JDK-8243320

 Added Entrust Root Certification Authority - G4 certificate

The following root certificate has been added to the cacerts truststore:

+ Entrust
  + entrustrootcag4
    DN: CN=Entrust Root Certification Authority - G4, OU="(c) 2015 Entrust, Inc. - for authorized use only", 
    OU=See, O="Entrust, Inc.", C=US
See JDK-8243321

 Enhanced Support of Proxy Class

The deserialization of java.lang.reflect.Proxy objects can be limited by setting the system property jdk.serialProxyInterfaceLimit. The limit is the maximum number of interfaces allowed per Proxy in the stream. Setting the limit to zero prevents any Proxies from being deserialized including Annotations, a limit of less than 2 might interfere with RMI operations.

JDK-8236862 (not public)

Bug Fixes

This release also contains fixes for security vulnerabilities described in the Oracle Critical Patch Update. For a more complete list of the bug fixes included in this release, see the JDK 15.0.1 Bug Fixes page.