# CVE-2026-45291: Cloudburst Network denial of service via parent Netty channel closure

Source: https://junglewise.ai/threats/cve-2026-45291-cloudburst-network-denial-of-service-via-parent-netty-channel  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-05. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2026-45291 · Severity: high · CVSS 7.5 · Published 2026-06-05

Cloudburst Network is a library used to handle network communications for software projects. A flaw in how the library handles certain network connections allows a remote attacker to crash the communication channel, making the affected software unreachable or unusable. This results in a denial-of-service where legitimate users cannot connect to the service.

Technologies: [CloudburstMC Network](https://junglewise.ai/threats/technologies/network). Vendors: [CloudburstMC](https://junglewise.ai/threats/vendors/cloudburstmc).

## Quick answers

**Is CVE-2026-45291 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45291 being exploited in the wild.

**How severe is CVE-2026-45291?** High severity, with a CVSS score of 7.5, published 5 June 2026.

**Which products and versions are affected?** CloudburstMC Network < 1.0.0.CR3-20260418.124334-32.

**Is there a fix for CVE-2026-45291?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-45291 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-45291?** Check whether you run CloudburstMC Network at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability exists in Cloudburst Network (specifically the netty-transport-raknet component) due to improper input validation during connection handling. An unauthenticated remote attacker can exploit this bug to trigger the closure of the parent Netty channel. This action renders the network transport layer inoperable, leading to a complete denial-of-service for the application. The issue is addressed in version 1.0.0.CR3-20260418.124334-32. Downstream projects like Geyser are also affected and should update to builds containing the patched library.

## Affected products

- CloudburstMC Network (netty-transport-raknet) < 1.0.0.CR3-20260418.124334-32

## Timeline

- 2026-05-12: advisory: GitHub advisory published by maintainers
- 2026-06-05: disclosed: NVD publication date

## References

- [https://github.com/CloudburstMC/Network/security/advisories/GHSA-rh6x-g5c8-2rmf](https://github.com/CloudburstMC/Network/security/advisories/GHSA-rh6x-g5c8-2rmf)

## Related threats

- [Cloudburst Network DoS in RakNet connection handling](https://junglewise.ai/threats/cve-2026-45290-cloudburst-network-dos-in-raknet-connection-handling)