jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

• CVE-2026-54515: 0.44% estimated exploitation activity in the next 30 days; percentile 38.53 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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(ACCEPTCASEINSENSITIVEPROPERTIES)) 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 Will be fixed in 2.18.9, 2.21.5, 2.22.1 and 3.1.4. Severity / CWE Maintainer: minor. Reporter: Moderate. CWE-915. Upstream fix FasterXML/jackson-databind#5962 (PR #5964,…

Published by the source

23 Jun 2026, 21:23 UTC

Last modified by the source

16 Jul 2026, 21:25 UTC

Source last checked

26 Oct 2026, 16:54 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5jmj-h7xm-6q6v

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# Patch Next advisory brief: CVE-2026-54515

Advisory: jackson-databind has case-insensitive deserialization bypasses per-property @JsonIgnoreProperties
IDs: CVE-2026-54515, GHSA-5jmj-h7xm-6q6v
Record: https://patchnext.com/advisories/cve-2026-54515 (revision 1, source checked 26 Oct 2026, 16:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tools.jackson.core:jackson-databind 3.1.4; com.fasterxml.jackson.core:jackson-databind 3.1.4, 2.22.1, 2.21.5, 2.18.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven tools.jackson.core:jackson-databind: affected >= 3.1.0, < 3.1.4; fixed in 3.1.4
- Maven com.fasterxml.jackson.core:jackson-databind: affected >= 3.1.0, < 3.1.4; >= 2.8.0, < 2.18.9; >= 2.19.0, < 2.21.5; >= 2.22.0, < 2.22.1; fixed in 2.22.1, 2.21.5, 2.18.9, 3.1.4

## Suggested inspection (read-only)
- Maven tools.jackson.core:jackson-databind: check the installed version with your package manager.
- Maven com.fasterxml.jackson.core:jackson-databind: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tools.jackson.core:jackson-databind, com.fasterxml.jackson.core:jackson-databind.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5jmj-h7xm-6q6v (GitHub-reviewed advisory GHSA-5jmj-h7xm-6q6v lists affected ranges: Maven com.fasterxml.jackson.core:jackson-databind >=3.1.0 =2.8.0 =2.19.0 =2.22.0 =3.1.0 <3.1.4)

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