Jackson Release 2.19.4

Patch version of 2.19, released on October 29, 2025. NOTE: immediate replacement of 2.19.3 released earlier in the day (with issues rendering it not working on JDK 8).

Following fixes are included in this patch release.

This is planned to be the last regular patch release from 2.19 branch.

Changes, core

None

Changes, data formats

Avro

• #601: Jackson subtype Avro schema unions are non-deterministic and therefore incompatible with each other

CBOR

• #599: Unable to deserialize stringref-enabled CBOR with ignored properties
• #616: CBOR text gets truncated on decoding

Ion

• #623: (ion) Upgrade ion-java dep to 1.11.11 (from 1.11.10)