CVE-2026-42188
LowCVSS 2.4Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
Geyser before version 2.9.3 contains a server-side request forgery (SSRF) vulnerability in handling 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.
Risk Assessment
Attackers can use the server to scan internal networks or attack other systems, potentially leading to data confidentiality and integrity breaches.
Recommendation
Update Geyser to version 2.9.3 or later, which includes the fix.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

