GHSA-rmj7-2vxq-3g9f

Suggest an improvement
Source
https://github.com/advisories/GHSA-rmj7-2vxq-3g9f
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-rmj7-2vxq-3g9f/GHSA-rmj7-2vxq-3g9f.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-rmj7-2vxq-3g9f
Aliases
  • CVE-2026-54513
Downstream
Related
Published
2026-06-23T21:22:15Z
Modified
2026-06-25T00:29:23.888358291Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
jackson-databind has an array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)
Details

Summary

BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist.

Impact

Applications using BasicPolymorphicTypeValidator with allowIfSubTypeIsArray() as a safeguard get no protection for concrete array component types; an attacker controlling JSON can instantiate non-allowlisted types via an array wrapper, re-opening the gadget-instantiation risk PTV is meant to prevent.

Affected / Patched (verified via git tag --contains)

  • 2.18 line: >= 2.10.0, < 2.18.8 -> fixed in 2.18.8
  • 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

PolymorphicTypeValidator was added in 2.10.0 so vulnerability N/A for versions prior to that.

Severity / CWE

Maintainer: significant. Reporter: HIGH. CWE-184 (Incomplete List of Disallowed Inputs); related CWE-502.

Upstream fix

FasterXML/jackson-databind#5981; fix PR #5983 (24529da), 2.18 backport PR #5984 (01d1692). Released 2026-06-04 in 2.18.8 / 2.21.4 / 3.1.4.

Credits

Omkhar Arasaratnam (@omkhar) - finder.

Database specific 
{
    "github_reviewed_at": "2026-06-23T21:22:15Z",
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-184"
    ],
    "nvd_published_at": null,
    "github_reviewed": true
}
References

Affected packages

Maven
com.fasterxml.jackson.core:jackson-databind

Package

Name
com.fasterxml.jackson.core:jackson-databind
View open source insights on deps.dev
Purl
pkg:maven/com.fasterxml.jackson.core/jackson-databind

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.10.0
Fixed
2.18.8

Affected versions

2.*
2.10.0
2.10.0.pr1
2.10.0.pr2
2.10.0.pr3
2.10.1
2.10.2
2.10.3
2.10.4
2.10.5
2.10.5.1
2.11.0.rc1
2.11.0
2.11.1
2.11.2
2.11.3
2.11.4
2.12.0-rc1
2.12.0-rc2
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.12.5
2.12.6
2.12.6.1
2.12.7
2.12.7.1
2.12.7.2
2.13.0-rc1
2.13.0-rc2
2.13.0
2.13.1
2.13.2
2.13.2.1
2.13.2.2
2.13.3
2.13.4
2.13.4.1
2.13.4.2
2.13.5
2.14.0-rc1
2.14.0-rc2
2.14.0-rc3
2.14.0
2.14.1
2.14.2
2.14.3
2.15.0-rc1
2.15.0-rc2
2.15.0-rc3
2.15.0
2.15.1
2.15.2
2.15.3
2.15.4
2.16.0-rc1
2.16.0
2.16.1
2.16.2
2.17.0-rc1
2.17.0
2.17.1
2.17.2
2.17.3
2.18.0-rc1
2.18.0
2.18.1
2.18.2
2.18.3
2.18.4
2.18.5
2.18.6
2.18.7

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-rmj7-2vxq-3g9f/GHSA-rmj7-2vxq-3g9f.json"
com.fasterxml.jackson.core:jackson-databind

Package

Name
com.fasterxml.jackson.core:jackson-databind
View open source insights on deps.dev
Purl
pkg:maven/com.fasterxml.jackson.core/jackson-databind

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.19.0
Fixed
2.21.4

Affected versions

2.*
2.19.0
2.19.1
2.19.2
2.19.3
2.19.4
2.20.0-rc1
2.20.0
2.20.1
2.20.2
2.21.0
2.21.1
2.21.2
2.21.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-rmj7-2vxq-3g9f/GHSA-rmj7-2vxq-3g9f.json"
com.fasterxml.jackson.core:jackson-databind

Package

Name
com.fasterxml.jackson.core:jackson-databind
View open source insights on deps.dev
Purl
pkg:maven/com.fasterxml.jackson.core/jackson-databind

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.0.0
Fixed
3.1.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-rmj7-2vxq-3g9f/GHSA-rmj7-2vxq-3g9f.json"
tools.jackson.core:jackson-databind

Package

Name
tools.jackson.core:jackson-databind
View open source insights on deps.dev
Purl
pkg:maven/tools.jackson.core/jackson-databind

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.0.0
Fixed
3.1.4

Affected versions

3.*
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.1.0-rc1
3.1.0
3.1.1
3.1.2
3.1.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-rmj7-2vxq-3g9f/GHSA-rmj7-2vxq-3g9f.json"