CVE-2026-42188: CWE-918: Server-Side Request Forgery (SSRF) in GeyserMC Geyser
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.
AI Analysis
Technical Summary
GeyserMC Geyser, a bridge between Minecraft: Bedrock Edition and Java Edition, contains an SSRF vulnerability (CWE-918) in versions before 2.9.3. The vulnerability arises from improper validation of Bedrock player head texture data, where a crafted Base64-encoded skin texture URL can trigger the server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side and can be exploited by a Bedrock client using the /give command. The issue is resolved in version 2.9.3.
Potential Impact
An attacker with Bedrock client access can cause the server to make arbitrary HTTP GET requests, potentially allowing internal network scanning or interaction with internal services. The CVSS score of 2.4 and low severity rating indicate that the confidentiality impact is limited, with no direct integrity or availability impact reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade GeyserMC Geyser to version 2.9.3 or later, where this SSRF vulnerability is fixed. Since no official patch links or vendor advisory details are provided, users should verify the update from the official GeyserMC sources. Patch status is not yet confirmed beyond the version fix note; check the vendor advisory for current remediation guidance.
CVE-2026-42188: CWE-918: Server-Side Request Forgery (SSRF) in GeyserMC Geyser
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.
CVSS v3.1
Score 2.4low
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GeyserMC Geyser, a bridge between Minecraft: Bedrock Edition and Java Edition, contains an SSRF vulnerability (CWE-918) in versions before 2.9.3. The vulnerability arises from improper validation of Bedrock player head texture data, where a crafted Base64-encoded skin texture URL can trigger the server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side and can be exploited by a Bedrock client using the /give command. The issue is resolved in version 2.9.3.
Potential Impact
An attacker with Bedrock client access can cause the server to make arbitrary HTTP GET requests, potentially allowing internal network scanning or interaction with internal services. The CVSS score of 2.4 and low severity rating indicate that the confidentiality impact is limited, with no direct integrity or availability impact reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade GeyserMC Geyser to version 2.9.3 or later, where this SSRF vulnerability is fixed. Since no official patch links or vendor advisory details are provided, users should verify the update from the official GeyserMC sources. Patch status is not yet confirmed beyond the version fix note; check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-25T01:53:21.583Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028746cbff5d86108b50d9
Added to database: 05/12/2026, 01:49:58 UTC
Last enriched: 05/19/2026, 09:36:57 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 90
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.