jackson-databind retains every unknown raw type ID — GHSA-WV8Q-QHHJ-9H54

Summary

### Summary With `@JsonTypeInfo(use = Id.NAME, defaultImpl = ...)`, every distinct unknown raw type ID selects the same fallback deserializer but is retained as a separate key in `TypeDeserializerBase._deserializers`. An attacker who can repeatedly supply new unknown type IDs can grow this process-lifetime cache without a configured bound. ### Details The affected path is `TypeDeserializerBase._findDeserializer()`.…

Timeline

Published by source

2026-09-30

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.5 out of 10.
• Reported EPSS value: 0.0045.
• Review exposure for the affected product or family: maven: com.fasterxml.jackson.core:jackson-databind | maven: tools.jackson.core:jackson-databind.

Product

maven: com.fasterxml.jackson.core:jackson-databind | maven: tools.jackson.core:jackson-databind

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-WV8Q-QHHJ-9H54

Source

GitHub

Vendor

GitHub

Published by source

2026-09-30

Last source activity

2026-09-30

Additional identifiers

CVE-2026-91776

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.