Server-Side Request Forgery Vulnerability in Geyser Bridge for Minecraft
CVE-2026-42188

2.4LOW

Key Information:

Vendor

Geysermc

Status
Geyser
Vendor
CVE Published:
11 May 2026

What is CVE-2026-42188?

Geyser, which bridges Minecraft: Bedrock Edition and Minecraft: Java Edition, had a vulnerability that allowed attackers to exploit Bedrock player head texture data. By providing a malicious Base64-encoded URL for skin textures via the /give command, an attacker could compel the Minecraft server to perform unauthorized HTTP GET requests to external or local endpoints. This flaw was a result of insufficient URL validation and could be triggered directly by Bedrock clients. Geyser has released version 2.9.3 to resolve this issue.

Affected Version(s)

Geyser < 2.9.3

References

https://github.com/GeyserMC/Geyser/security/advisories/GH...
x_refsource_CONFIRM

CVSS V3.1

Score:
2.4
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.