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Add warning for KryoCoder deserialization #40456

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Merged
Abacn merged 1 commit into from
Oct 9, 2026
Merged

Add warning for KryoCoder deserialization #40456

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7 changes: 7 additions & 0 deletions sdks/java/extensions/kryo/src/main/java/org/apache/beam/sdk/extensions/kryo/KryoCoder.java
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Expand Up @@ -41,6 +41,13 @@
* Coder using Kryo as (de)serialization mechanism. See {@link KryoCoderProvider} to get more
* details about usage.
*
* <p><b>Warning:</b> Kryo deserialization (especially with the default {@code
* kryoRegistrationRequired=false} setting in {@link KryoOptions}) can instantiate arbitrary classes
* and is unsafe when applied to untrusted data. Do not use {@link KryoCoder} to deserialize
* untrusted external input. To restrict deserialization to an explicit set of allowed classes,
* enable {@link KryoOptions#setKryoRegistrationRequired(boolean)} and register classes via {@link
* KryoRegistrar}.
*
* @param <T> type of element coder can handle
*/
public class KryoCoder<T> extends CustomCoder<T> {
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