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

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Summary

CVECVE-2026-42188
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 22:22:11 UTC
Updated2026-05-11 22:22:11 UTC
DescriptionGeyser 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.

Risk And Classification

Primary CVSS: v3.1 2.4 LOW from [email protected]

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

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.4LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N
3.1CNADECLARED2.4LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GeyserMC Geyser affected < 2.9.3 Not specified

References

ReferenceSourceLinkTags
github.com/GeyserMC/Geyser/security/advisories/GHSA-xcfg-fcr5-gw9r [email protected] github.com
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