CVE-2026-42188

Published: May 11, 2026Modified: May 13, 2026

2.4

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

Exploitability: 0.9 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

Description

Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Prior to 2.9.3, a server-side request forgery (SSRF) vulnerability exists in Geyser’s handling of Bedrock player head texture data. By supplying a crafted Base64-encoded skin texture URL via the /give command, an attacker can cause the Minecraft server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side, without proper URL validation, and can be triggered by a Bedrock client. This vulnerability is fixed in 2.9.3.

Related CWEs

CWE-918

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

References (2)

https://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r

Source: security-advisories@github.com

https://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.