Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M
CVE-2026-54515jackson-databind: Case-insensitive deserialization bypasses per-property @JsonIgnoreProperties
Medium 5.3
In plain English
A medium-severity security flaw in jackson-databind from FasterXML. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | jackson-databind | no fix listed | DEBIAN-CVE-2026-54515 |
| Debian:13 | jackson-databind | no fix listed | DEBIAN-CVE-2026-54515 |
| Debian:14 | jackson-databind | 2.18.11-1 | DEBIAN-CVE-2026-54515 |
| Maven | com.fasterxml.jackson.core:jackson-databind | 2.18.9 | GHSA-5jmj-h7xm-6q6v |
| Maven | com.fasterxml.jackson.core:jackson-databind | 2.22.1 | GHSA-5jmj-h7xm-6q6v |
| Maven | com.fasterxml.jackson.core:jackson-databind | 3.1.4 | GHSA-5jmj-h7xm-6q6v |
| Maven | com.fasterxml.jackson.core:jackson-databind | 2.21.5 | GHSA-5jmj-h7xm-6q6v |
| Maven | tools.jackson.core:jackson-databind | 3.1.4 | GHSA-5jmj-h7xm-6q6v |
| Ubuntu:22.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54515 |
| Ubuntu:24.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54515 |
| Ubuntu:25.10 | jackson-databind | no fix listed | UBUNTU-CVE-2026-54515 |
| Ubuntu:26.04:LTS | jackson-databind | no fix listed | UBUNTU-CVE-2026-54515 |
| Ubuntu:26.10 | jackson-databind | no fix listed | UBUNTU-CVE-2026-54515 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| FasterXML | jackson-databind | >= 2.8.0, < 2.18.9>= 2.19.0, < 2.21.5>= 3.1.0, < 3.1.4 |
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-5jmj-h7xm-6q6v x_refsource_CONFIRM
- https://github.com/FasterXML/jackson-databind/issues/5962 x_refsource_MISC
- https://github.com/FasterXML/jackson-databind/issues/5964 x_refsource_MISC
- https://github.com/FasterXML/jackson-databind/commit/0e1b0b211f7a53baa62ba2f4c9bd006c7bf4d5fa x_refsource_MISC