CVE-2026-59888: jackson-databind @JsonIgnore On A Record Property Vulnerability

MODERATE
Advisory Identifier: GHSA-3pjw-73gf-8qr5
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CVSS 6.5
CWE-915
Published
Advisory Summary

CVE-2026-59888 is a MODERATE (CVSS 6.5) @jsonignore on a record property vulnerability (CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes) affecting jackson-databind libraries in the Maven ecosystem. The issue involves @jsonignore on a record property is bypassed with a propertynamingstrategy. Remediation is available by upgrading affected packages to version 2.18.8, 2.21.4, 3.1.4.

CVE-2026-59888 at a Glance

CVE Identifier CVE-2026-59888
GHSA Identifier GHSA-3pjw-73gf-8qr5
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
Affected Product jackson-databind
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-59888

To remediate this vulnerability, upgrade all affected jackson-databind dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.fasterxml.jackson.core:jackson-databind fixed: 2.18.8 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.18.8</version>
</dependency>
com.fasterxml.jackson.core:jackson-databind fixed: 2.21.4 
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.21.4</version>
</dependency>
tools.jackson.core:jackson-databind fixed: 3.1.4 
<dependency>
    <groupId>tools.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>3.1.4</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=com.fasterxml.jackson.core

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-59888, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.fasterxml.jackson.core

Analyze the terminal output to locate any version of jackson-databind in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.18.8), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.fasterxml.jackson.core command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes, where the product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. In jackson-databind, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary For Java Records, `POJOPropertiesCollector._removeUnwantedIgnorals()` records a `@JsonIgnore`-annotated component under its original implicit name before `_renameUsing()` applies the `PropertyNamingStrategy`. After the rename, `_ignoredPropertyNames` still holds only the pre-rename name, so `_ignorableProps` is built from the stale key. The renamed JSON key passes `IgnorePropertiesUtil.shouldIgnore()` and is assigned to the Record's constructor parameter, defeating the `@JsonIgnore`. ## Impact A Record using a naming strategy that relies on `@JsonIgnore` to keep an internal/privileged component out of deserialization can have that component set from the wire via its renamed key (e.g. a role/flag controlled by an untrusted client). ## Affected / Patched (verified via `git tag --contains`) - 2.15-2.18 line: `>= 2.15.0, < 2.18.8` -> fixed in **2.18.8** (backport `c7c6783`) - 2.19-2.21 line: `>= 2.19.0, < 2.21.4` -> fixed in **2.21.4** - 3.x line: `>= 3.0.0, < 3.1.4` -> fixed in **3.1.4** (#5974, `baa2cdf`) ## Severity / CWE Maintainer: minor. Reporter: Moderate. CWE-915; related CWE-345. ## Credits Omkhar Arasaratnam (@omkhar) - finder.

CVE-2026-59888 Affected jackson-databind Versions

3 component(s)
Fixed Versions:
2.18.82.21.43.1.4
Product / Package Ecosystem Affected Versions Fixed Version
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.15.0
< 2.18.8
2.18.8
com.fasterxml.jackson.core:jackson-databind
maven/com.fasterxml.jackson.core/jackson-databind
Maven
≥ 2.19.0
< 2.21.4
2.21.4
tools.jackson.core:jackson-databind
maven/tools.jackson.core/jackson-databind
Maven
≥ 3.0.0
< 3.1.4
3.1.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-3pjw-73gf-8qr5
NVD — CVE-2026-59888 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59888
jackson-databind Source Repository REPOSITORY
https://github.com/FasterXML/jackson-databind/pull/5974
Security Fix Commit FIX COMMIT
https://github.com/FasterXML/jackson-databind/commit/baa2cdf5ca2b2717fbb88d91955d69d8651df3e4
jackson-databind Source Repository REPOSITORY
https://github.com/FasterXML/jackson-databind
Security Fix Commit FIX COMMIT
https://github.com/FasterXML/jackson-databind/commit/c7c678360624da5bc7eed2152789fa522880db9d

Frequently Asked Questions

What is CVE-2026-59888?
CVE-2026-59888 is a security vulnerability in jackson-databind involving @JsonIgnore on a Record property is bypassed with a PropertyNamingStrategy under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes.
Which jackson-databind versions are affected?
Affected versions include releases prior to 2.18.8, 2.21.4, 3.1.4 across affected packages: com.fasterxml.jackson.core:jackson-databind, tools.jackson.core:jackson-databind.
What version fixes CVE-2026-59888?
Upgrading to 2.18.8, 2.21.4, 3.1.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jackson-databind affected?
Yes, com.fasterxml.jackson.core:jackson-databind is affected in releases prior to 2.18.8, 2.21.4, 3.1.4. Upgrade your dependency to 2.18.8, 2.21.4, 3.1.4 or later.
What is the CVSS score of CVE-2026-59888?
CVE-2026-59888 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-59888?
CVE-2026-59888 is classified under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes (The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.).
How can I check Maven dependencies for CVE-2026-59888?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.fasterxml.jackson.core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-3pjw-73gf-8qr5",
  "modified" : "2026-07-21T19:33:06Z",
  "published" : "2026-07-21T19:33:06Z",
  "aliases" : [ "CVE-2026-59888" ],
  "summary" : "jackson-databind: @JsonIgnore on a Record property is bypassed with a PropertyNamingStrategy",
  "details" : "## Summary\nFor Java Records, `POJOPropertiesCollector._removeUnwantedIgnorals()` records a `@JsonIgnore`-annotated component under its original implicit name before `_renameUsing()` applies the `PropertyNamingStrategy`. After the rename, `_ignoredPropertyNames` still holds only the pre-rename name, so `_ignorableProps` is built from the stale key. The renamed JSON key passes `IgnorePropertiesUtil.shouldIgnore()` and is assigned to the Record's constructor parameter, defeating the `@JsonIgnore`.\n\n## Impact\nA Record using a naming strategy that relies on `@JsonIgnore` to keep an internal/privileged component out of deserialization can have that component set from the wire via its renamed key (e.g. a role/flag controlled by an untrusted client).\n\n## Affected / Patched (verified via `git tag --contains`)\n- 2.15-2.18 line: `>= 2.15.0, < 2.18.8` -> fixed in **2.18.8** (backport `c7c6783`)\n- 2.19-2.21 line: `>= 2.19.0, < 2.21.4` -> fixed in **2.21.4**\n- 3.x line: `>= 3.0.0, < 3.1.4` -> fixed in **3.1.4** (#5974, `baa2cdf`)\n\n## Severity / CWE\nMaintainer: minor. Reporter: Moderate. CWE-915; related CWE-345.\n\n## Credits\nOmkhar Arasaratnam (@omkhar) - finder.",
  "severity" : [ {
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  }, {
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  }, {
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    "url" : "https://github.com/FasterXML/jackson-databind/commit/baa2cdf5ca2b2717fbb88d91955d69d8651df3e4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FasterXML/jackson-databind/commit/c7c678360624da5bc7eed2152789fa522880db9d"
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    "nvd_published_at" : "2026-07-14T17:17:15Z"
  }
}