CVE-2026-42188

LOW

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 2.4
EPSS 0.0016
EPSS Percentile 5.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (2)
GeyserMC/Geyser < 2.9.3
org.geysermc.geyser/core 0 - 2.9.3Maven
Published May 11, 2026
Tracked Since May 12, 2026