Quick answers
- Is CVE-2026-45290 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-45290 being exploited in the wild.
- How severe is CVE-2026-45290?
- High severity, with a CVSS score of 7.5, published 5 June 2026.
- Which products and versions are affected?
- CloudburstMC Network < 1.0.0.CR3-20260417.085727-30.
- Is there a fix for CVE-2026-45290?
- 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-2026-45290 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-45290?
- 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 denial-of-service (DoS) vulnerability exists in Cloudburst Network (specifically the netty-transport-raknet component) due to missing bound checks during RakNet connection handling. By sending specially crafted packets, a remote, unauthenticated attacker can trigger a condition that stalls the Netty event loop. Because the event loop is responsible for processing I/O tasks, stalling it renders the entire network stack inoperable for the affected application. The vulnerability is classified as CWE-770 (Allocation of Resources Without Limits or Throttling). Users should update to version 1.0.0.CR3-20260417.085727-30 or later; Geyser users should update to Build #1114 or higher.
Affected products
- CloudburstMC Network (netty-transport-raknet) < 1.0.0.CR3-20260417.085727-30
Timeline
- 2026-05-12: advisory: GitHub Security Advisory published
- 2026-06-05: disclosed: NVD publication date