CVE-2026-42188 LOW

CVE-2026-42188: Geyser: Server-Side Request Forgery (SSRF) via Player Head Texture URL

Vendor Geysermc
Product Geyser
Weakness CWE-918 · SSRF
Published May 11, 2026
Last update May 13, 2026
View on NVD All CVEs

CVSS base score

2.4/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 13, 2026 Record updated