CVE-2018-21234

Deserialization of Untrusted Data in Jodd

9.8 CriticalFix available

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

8.32%Up 7.5 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: CVE-2018-21234
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-502
Updated: 2026-11-02

CVE List No score

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: CVE-2018-21234
Updated: 2026-11-02

EUVDEUVD-2022-1082 No score

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: EUVD-2022-1082
Updated: 2026-11-03

GitHub AdvisoriesGHSA-jrg3-qq99-35g7 9.8

Deserialization of Untrusted Data in Jodd

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: GHSA-jrg3-qq99-35g7
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-502
Updated: 2026-11-02

OSV 9.8

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: CVE-2018-21234
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-jrg3-qq99-35g7 9.8

Deserialization of Untrusted Data in Jodd

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: GHSA-jrg3-qq99-35g7
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-502
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-21234 9.8

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Record: UBUNTU-CVE-2018-21234
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.jodd:jodd-json` Maven	before 5.0.4	5.0.4
`org.jodd:jodd-json` Maven	before 5.0.4, plus listed versions 3.63.6-RC13.6.13.6.23.6.2-BETA1 Show 32 moreShow less 3.6.33.6.43.6.4-liferay3.6.53.6.5-BETA13.6.63.6.73.6.83.73.7.13.83.8.03.8.13.8.53.8.63.93.9.14.0.04.1.04.1.14.1.24.1.34.1.44.1.54.2.04.3.04.3.14.3.25.0.05.0.15.0.25.0.3	5.0.4
`jodd` Ubuntu:20.04:LTS	All versions, plus listed versions 3.8.6-1	None known
`jodd` Ubuntu:22.04:LTS	All versions, plus listed versions 3.8.6-1.1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-21234 is a critical vulnerability (CVSS 9.8) in Jodd, published May 21, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 8.32%, the 94th percentile. Fixed in org.jodd:jodd-json 5.0.4.

References

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