CVE-2026-42188

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

State: Published
Severity: 2.4 Low
Published: May 11, 2026
Updated: May 13, 2026
Reserved: Apr 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	2.4 Low	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
GeyserGeyserMC	< 2.9.3Affected

References

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

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