CVE-2023-33008: Apache Johnzon: Prevent inefficient internal conversion from BigDecimal at large scale

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-07 · updated 2026-06-17
Weakness: CWE-502

Description

Deserialization of Untrusted Data vulnerability in Apache Software Foundation Apache Johnzon. A malicious attacker can craft up some JSON input that uses large numbers (numbers such as 1e20000000) that Apache Johnzon will deserialize into BigDecimal and maybe use numbers too large which may result in a slow conversion (Denial of service risk). Apache Johnzon 1.2.21 mitigates this by setting a scale limit of 1000 (by default) to the BigDecimal. This issue affects Apache Johnzon: through 1.2.20.

Affected products

Apache Software Foundation Apache Johnzon: before 1.2.21 — fixed in 1.2.21

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Johnzon 1.2.21. Check the vendor advisory for mitigations.

References

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