GHSA-5jmj-h7xm-6q6v
jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties
Details
## Summary In `BeanDeserializerBase.createContextual()`, per-property `@JsonIgnoreProperties` exclusions are applied by `_handleByNameInclusion()`, producing a `contextual` deserializer whose `BeanPropertyMap` has the ignored properties removed. The subsequent per-property case-insensitivity block (triggered by `@JsonFormat(ACCEPT_CASE_INSENSITIVE_PROPERTIES)`) rebuilds from `this._beanProperties` (the original, unfiltered map) instead of `contextual._beanProperties`, then overwrites the filtered map — restoring every property `_handleByNameInclusion` had just removed. The ignored property becomes writable again.
## Impact An application that both enables case-insensitive matching and relies on per-property `@JsonIgnoreProperties` to keep a field unwritable can have that field set from untrusted JSON (mass-assignment-style write).
## Affected / Patched Fixed in 2.18.9, 2.21.5 and 3.1.4.
## Severity / CWE Maintainer: minor. Reporter: Moderate. CWE-915.
## Upstream fix FasterXML/jackson-databind#5962 (PR #5964, `0e1b0b2`), milestone 3.1.4. Released 2026-06-04.
## Credits Omkhar Arasaratnam (@omkhar) - finder.
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Affected packages
3.1.0 Fixed in: 3.1.4 # pom.xml: bump <version>3.1.4</version> for com.fasterxml.jackson.core:jackson-databind 3.1.0 Fixed in: 3.1.4 # pom.xml: bump <version>3.1.4</version> for tools.jackson.core:jackson-databind 2.8.0 Fixed in: 2.18.9 # pom.xml: bump <version>2.18.9</version> for com.fasterxml.jackson.core:jackson-databind 2.19.0 Fixed in: 2.21.5 # pom.xml: bump <version>2.21.5</version> for com.fasterxml.jackson.core:jackson-databind References
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-5jmj-h7xm-6q6v [WEB]
- https://github.com/FasterXML/jackson-databind/issues/5962 [WEB]
- https://github.com/FasterXML/jackson-databind/issues/5964 [WEB]
- https://github.com/FasterXML/jackson-databind/commit/0e1b0b211f7a53baa62ba2f4c9bd006c7bf4d5fa [WEB]
- https://github.com/FasterXML/jackson-databind [PACKAGE]