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

> Attackers can bypass @JsonIgnoreProperties restrictions to modify ignored fields when case-insensitive deserialization is enabled in jackson-databind.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** CLEANSTART-2026-DD70166, CLEANSTART-2026-FF85113, CLEANSTART-2026-LF37858, CLEANSTART-2026-MV24279, CLEANSTART-2026-NC55422, CLEANSTART-2026-NQ89106, CLEANSTART-2026-OE96046, CLEANSTART-2026-OP16049, CLEANSTART-2026-QF50624, CLEANSTART-2026-RR27418, CLEANSTART-2026-XO33463, CLSA-2026-1793106103, DEBIAN-CVE-2026-54515, ECHO-2294-b00a-6417, GHSA-5jmj-h7xm-6q6v, MINI-2456-743m-h4j8, MINI-2f57-fwww-ffx9, MINI-2m58-rv7c-fcjh, MINI-2px3-ffp6-r55g, MINI-3545-6xh8-hc28, MINI-37vh-9m6r-gg5p, MINI-384x-w6rg-hwrg, MINI-3cm3-26rj-mg87, MINI-3gch-gr9j-3pq9, MINI-3j63-m8ch-34h3, MINI-3rfg-gpqg-m5c7, MINI-3rgp-4v59-6wgr, MINI-3w7q-pg92-gxvf, MINI-42hg-gf6x-r4qg, MINI-467v-q45c-9x7x, MINI-48g5-qgwj-x7hf, MINI-4cgq-46c4-6m89, MINI-4cmv-fhp7-fc89, MINI-4pvq-5q77-m729, MINI-565f-2xm6-963m, MINI-59f5-52j5-jmv9, MINI-5hm9-6q4p-mf97, MINI-5pf5-v6cw-9499, MINI-5qj5-mcv3-g6jc, MINI-5rrh-xc52-h2h7, MINI-653q-38v4-7q8r, MINI-65v9-mp4m-hwj3, MINI-6875-j36p-hrm8, MINI-697p-2r84-29p8, MINI-69pr-6gc8-85ph, MINI-6j38-g9gc-4r5r, MINI-6p62-rrjh-388w, MINI-6q37-qmvr-q2wm, MINI-7689-37p2-ffq3, MINI-76jg-2m33-wr9h, MINI-7g45-ccq7-g6f7, MINI-7m29-5x7g-q62p, MINI-7rv9-m2f8-m5xr, MINI-83pq-jpr4-894f, MINI-85gm-8vm2-hw6r, MINI-8764-p6qv-9pw7, MINI-8fvw-j6w8-7w5v, MINI-8gf6-f7xr-xw4g, MINI-8hmp-44ww-hrcq, MINI-8qgg-4m5h-224p, MINI-8r3p-7227-w33x, MINI-8rmx-7f9c-77q8, MINI-8rwc-xrf7-32x6, MINI-8wm7-x68v-22cv, MINI-8x47-4pxc-xwg3, MINI-96fw-cvx7-r297, MINI-9gf3-v9qc-hf9m, MINI-9p5v-mx9v-8c2m, MINI-9r6q-v76v-46pm, MINI-9vmv-3vm8-wfvr, MINI-9wwh-wx6r-fp7g, MINI-9xc7-w54h-9x3r, MINI-c373-f9gq-56qr, MINI-c57q-qqmr-7p7g, MINI-ccjc-ffrp-fwpr, MINI-cjwv-cm6q-2xpr, MINI-cmxw-4q3v-w5gh, MINI-f46c-rfx8-mpx2, MINI-f6h3-3ghg-jg7f, MINI-f966-46j8-pq8r, MINI-fhvm-www4-p834, MINI-g6f4-q6rg-cvqc, MINI-g6w9-x28p-6gh4, MINI-g975-g93c-v2wf, MINI-gh5c-jj6j-cmr8, MINI-gmqc-8j3w-mh9m, MINI-gph7-qmp7-cxqc, MINI-gxwh-qmgp-c7pf, MINI-h493-6x7p-x887, MINI-h8pv-cwm2-xc9v, MINI-hcw7-j775-xx8c, MINI-hp69-qm73-gwmp, MINI-hr37-pc93-53mr, MINI-hxhw-jxjf-24vv, MINI-j8j3-jcvf-gv7q, MINI-j8w3-39cf-mqqp, MINI-jfcm-p89g-46j9, MINI-jfp5-c974-jrff, MINI-jgqp-hxmp-27qm, MINI-jh38-rp46-8pv3, MINI-jpvc-r2x8-fc88, MINI-jx2x-6pcm-9wvw, MINI-m5xg-3mp7-mgqw, MINI-m8cp-hgj9-gw9x, MINI-mcmj-8q4m-c5wq, MINI-mfh2-rww2-4pw9, MINI-mfmx-47cr-5wpc, MINI-mr64-mqxf-56qw, MINI-mvw6-wxmr-ghpm, MINI-mw42-52mh-rgcg, MINI-p3wq-9cg8-2mv9, MINI-p436-7p4q-w947, MINI-p4vg-qqvh-g3cw, MINI-p62r-xhc4-xmm8, MINI-pp72-q8x5-6gv4, MINI-pxp9-3r57-phjv, MINI-q2rh-cfmh-hx9v, MINI-qf42-h2pq-7v9h, MINI-qjx9-pm82-727w, MINI-qp9r-mg2p-58m3, MINI-qx36-pxrh-wxr2, MINI-r7xr-prmv-qjhg, MINI-rgcw-p5jh-4p2c, MINI-rjgm-9g6w-pf36, MINI-vf65-84xx-5fwm, MINI-vhfm-2gr3-84g8, MINI-vqxv-7vfr-p46f, MINI-vvh4-g6xm-3m6j, MINI-vvxx-xx5m-g8wm, MINI-vx6g-6jq7-779r, MINI-w264-wgjw-2xxj, MINI-w6w4-8qvp-mr35, MINI-wg2q-j873-35r3, MINI-whv4-hjfx-9r2g, MINI-wp4h-cfgf-rcvf, MINI-wx25-4p8v-7vhq, MINI-x58v-xq3f-4vpv, MINI-xw3v-7gv4-j9r4, ROOT-APP-MAVEN-CVE-2026-54515, UBUNTU-CVE-2026-54515

## What is CVE-2026-54515?

CVE-2026-54515 is a medium-severity unsafe deserialization vulnerability in Fasterxml Jackson-Databind, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-915 (Improperly Controlled Modification of Dynamically-Determined Object Attributes)

## Which versions are affected by CVE-2026-54515?

10 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-databind and tools.jackson.core:jackson-databind. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.19.0 | 2.21.5 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.19.0 | 2.21.5 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.22.0 | 2.22.1 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.22.0 | 2.22.1 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.8.0 | 2.18.9 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.8.0 | 2.18.9 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 3.1.0 | 3.1.4 |
| `com.fasterxml.jackson.core:jackson-databind` | Maven | From 3.1.0 | 3.1.4 |
| `tools.jackson.core:jackson-databind` | Maven | From 3.1.0 | 3.1.4 |
| `tools.jackson.core:jackson-databind` | Maven | From 3.1.0 | 3.1.4 |

Products: Fasterxml Jackson-Databind.

## How do I fix CVE-2026-54515?

Upgrade com.fasterxml.jackson.core:jackson-databind to a fixed version for your release line: 2.21.5, 2.22.1, 2.18.9 or 3.1.4.

## Is CVE-2026-54515 being exploited?

There is no known exploitation of CVE-2026-54515 in the wild and no public exploit code.

Public exploit code:

- jackson-databind + jackson-core 26 条安全公告自查:按坐标逐条求交集给出真正到位的版本(2.18.11/2.21.7/2.22.3/3.1.7/3.2.3,2.21.6 已不够);扫源码降噪告诉你真中几条;含 1 条 GitHub 全局库未收录、Dependabot 不报的(jackson-core 那条,升了 databind 也照样中) CVE-2026-54515 / CVE-2026-54512 (github_poc): https://github.com/xiaoqiMikko/jackson-check

## Other vulnerabilities in Fasterxml Jackson-Databind

- [CVE-2018-11307](https://insights.sbomify.com/CVE-2018-11307/): Deserialization of Untrusted Data in jackson-databind (critical 9.8)
- [CVE-2026-54512](https://insights.sbomify.com/CVE-2026-54512/): jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbitrary class instantiation (high 8.1)
- [CVE-2026-54513](https://insights.sbomify.com/CVE-2026-54513/): jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray) (high 8.1)
- [CVE-2020-14060](https://insights.sbomify.com/CVE-2020-14060/): Deserialization of untrusted data in Jackson Databind (high 8.1)
- [CVE-2021-46877](https://insights.sbomify.com/CVE-2021-46877/): jackson-databind possible Denial of Service if using JDK serialization to serialize JsonNode (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54515 and fix it if it is affected.

What it is: CVE-2026-54515 is a medium-severity unsafe deserialization vulnerability in Fasterxml Jackson-Databind, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-54515 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.19.0; fixed in 2.21.5
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.19.0; fixed in 2.21.5
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.22.0; fixed in 2.22.1
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.22.0; fixed in 2.22.1
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.8.0; fixed in 2.18.9
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.8.0; fixed in 2.18.9
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 3.1.0; fixed in 3.1.4
- com.fasterxml.jackson.core:jackson-databind (Maven): affected from 3.1.0; fixed in 3.1.4
- tools.jackson.core:jackson-databind (Maven): affected from 3.1.0; fixed in 3.1.4
- tools.jackson.core:jackson-databind (Maven): affected from 3.1.0; fixed in 3.1.4

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54515/ (Markdown: https://insights.sbomify.com/CVE-2026-54515/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54515
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54515
- OSV: https://osv.dev/vulnerability/CVE-2026-54515

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54515/
Summaries are generated and may contain mistakes; the official description above is the record.