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    CVE-2026-42188

    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.

    Published:May 11, 2026
    Last Modified:Aug 25, 2026
    EPS:May 11, 2026
    EPSS Score:0.00159
    CVSS Score:2.4

    Affected Products

    Vendor
    Geysermc
    Product
    Geyser

    Exploits

    https://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9rhttps://github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High